feat(examples): update SlackClone to use typed PostgREST API

[grdsdev]

Summary

Stacked on #1036 — adopts the typed PostgREST API (@Table, @SelectionOf, @Relationship, typed builders) in the SlackClone example.

• Annotate User, Channel, Message with @Table macros
• Add MessageWithDetails @SelectionOf for the join query with @Relationship
• Replace raw string queries with type-safe from(T.self), eq(\.keyPath), order(\.keyPath)
• Replace AddChannel/NewMessage with generated Insert nested types
• Remove MessagePayload in favour of Message (the @Table type)
• Remove convertToSnakeCase/convertFromSnakeCase encoder/decoder strategies (@Table CodingKeys carry explicit snake_case strings)
• Wire SupabaseSwiftMacros into the SlackClone Xcode target (local package reference + framework link)

Depends on #1036 merging first.

Test plan

• SlackClone example target builds

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[github-actions]

⚠️ Capability matrix drift detected

The following capabilities are marked implemented in swift but have no registered symbols to verify:

• auth.passkey.register_passkey (no symbols list — cannot confirm implementation exists)
• auth.passkey.sign_in_with_passkey (no symbols list — cannot confirm implementation exists)
• client.authentication_integration.third_party_auth (no symbols list — cannot confirm implementation exists)
• client.authentication_integration.cross_client_token_sync (no symbols list — cannot confirm implementation exists)
• client.authentication_integration.oauth_flow_type (no symbols list — cannot confirm implementation exists)
• client.authentication_integration.session_url_detection (no symbols list — cannot confirm implementation exists)
• client.session_management.custom_storage (no symbols list — cannot confirm implementation exists)
• client.session_management.persist_session (no symbols list — cannot confirm implementation exists)
• client.request_configuration.global_headers (no symbols list — cannot confirm implementation exists)
• client.observability.trace_propagation (no symbols list — cannot confirm implementation exists)
• database.query.from_table (no symbols list — cannot confirm implementation exists)
• database.query.select (no symbols list — cannot confirm implementation exists)
• database.query.schema_selection (no symbols list — cannot confirm implementation exists)
• database.query.rpc (no symbols list — cannot confirm implementation exists)
• database.mutate.insert (no symbols list — cannot confirm implementation exists)
• database.mutate.update (no symbols list — cannot confirm implementation exists)
• database.mutate.upsert (no symbols list — cannot confirm implementation exists)
• database.mutate.delete (no symbols list — cannot confirm implementation exists)
• database.mutate.select_after_mutation (no symbols list — cannot confirm implementation exists)
• database.using_filters.eq (no symbols list — cannot confirm implementation exists)
• database.using_filters.neq (no symbols list — cannot confirm implementation exists)
• database.using_filters.gt (no symbols list — cannot confirm implementation exists)
• database.using_filters.gte (no symbols list — cannot confirm implementation exists)
• database.using_filters.lt (no symbols list — cannot confirm implementation exists)
• database.using_filters.lte (no symbols list — cannot confirm implementation exists)
• database.using_filters.like (no symbols list — cannot confirm implementation exists)
• database.using_filters.ilike (no symbols list — cannot confirm implementation exists)
• database.using_filters.is (no symbols list — cannot confirm implementation exists)
• database.using_filters.in (no symbols list — cannot confirm implementation exists)
• database.using_filters.contains (no symbols list — cannot confirm implementation exists)
• database.using_filters.contained_by (no symbols list — cannot confirm implementation exists)
• database.using_filters.range_gt (no symbols list — cannot confirm implementation exists)
• database.using_filters.range_gte (no symbols list — cannot confirm implementation exists)
• database.using_filters.range_lt (no symbols list — cannot confirm implementation exists)
• database.using_filters.range_lte (no symbols list — cannot confirm implementation exists)
• database.using_filters.range_adjacent (no symbols list — cannot confirm implementation exists)
• database.using_filters.overlaps (no symbols list — cannot confirm implementation exists)
• database.using_filters.text_search (no symbols list — cannot confirm implementation exists)
• database.using_filters.match (no symbols list — cannot confirm implementation exists)
• database.using_filters.not (no symbols list — cannot confirm implementation exists)
• database.using_filters.or (no symbols list — cannot confirm implementation exists)
• database.using_filters.raw (no symbols list — cannot confirm implementation exists)
• database.using_filters.regex (no symbols list — cannot confirm implementation exists)
• database.using_filters.regex_icase (no symbols list — cannot confirm implementation exists)
• database.using_filters.is_distinct (no symbols list — cannot confirm implementation exists)
• database.using_filters.like_all (no symbols list — cannot confirm implementation exists)
• database.using_filters.like_any (no symbols list — cannot confirm implementation exists)
• database.using_filters.ilike_all (no symbols list — cannot confirm implementation exists)
• database.using_filters.ilike_any (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.order (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.limit (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.range (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.single_row (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.strip_nulls (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.format_csv (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.format_geojson (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.max_affected_rows (no symbols list — cannot confirm implementation exists)
• database.using_modifiers.request_cancellation (no symbols list — cannot confirm implementation exists)
• database.configuration.auto_retry (no symbols list — cannot confirm implementation exists)
• functions.invocation.invoke (no symbols list — cannot confirm implementation exists)
• functions.invocation.set_auth_token (no symbols list — cannot confirm implementation exists)
• functions.invocation.method_override (no symbols list — cannot confirm implementation exists)
• functions.invocation.streaming_response (no symbols list — cannot confirm implementation exists)
• functions.invocation.request_cancellation (no symbols list — cannot confirm implementation exists)
• realtime.client.connect (no symbols list — cannot confirm implementation exists)
• realtime.client.disconnect (no symbols list — cannot confirm implementation exists)
• realtime.client.get_channels (no symbols list — cannot confirm implementation exists)
• realtime.client.remove_channel (no symbols list — cannot confirm implementation exists)
• realtime.client.remove_all_channels (no symbols list — cannot confirm implementation exists)
• realtime.client.connection_state (no symbols list — cannot confirm implementation exists)
• realtime.client.listen_heartbeats (no symbols list — cannot confirm implementation exists)
• realtime.client.set_auth_token (no symbols list — cannot confirm implementation exists)
• realtime.client.channel (no symbols list — cannot confirm implementation exists)
• realtime.channel.subscribe (no symbols list — cannot confirm implementation exists)
• realtime.channel.unsubscribe (no symbols list — cannot confirm implementation exists)
• realtime.channel.send (no symbols list — cannot confirm implementation exists)
• realtime.channel.broadcast_http (no symbols list — cannot confirm implementation exists)
• realtime.subscriptions.postgres_changes (no symbols list — cannot confirm implementation exists)
• realtime.subscriptions.subscribe_presence (no symbols list — cannot confirm implementation exists)
• realtime.subscriptions.private_channel (no symbols list — cannot confirm implementation exists)
• realtime.subscriptions.broadcast_self (no symbols list — cannot confirm implementation exists)
• realtime.subscriptions.broadcast_ack (no symbols list — cannot confirm implementation exists)
• realtime.subscriptions.broadcast_replay (no symbols list — cannot confirm implementation exists)
• realtime.presence.track (no symbols list — cannot confirm implementation exists)
• realtime.presence.untrack (no symbols list — cannot confirm implementation exists)
• realtime.presence.presence_key (no symbols list — cannot confirm implementation exists)
• realtime.configuration.custom_websocket_transport (no symbols list — cannot confirm implementation exists)
• realtime.configuration.reconnect_backoff (no symbols list — cannot confirm implementation exists)
• realtime.configuration.heartbeat_interval (no symbols list — cannot confirm implementation exists)
• realtime.configuration.access_token_callback (no symbols list — cannot confirm implementation exists)
• realtime.configuration.deferred_disconnect (no symbols list — cannot confirm implementation exists)
• realtime.configuration.custom_logger (no symbols list — cannot confirm implementation exists)
• realtime.configuration.binary_protocol (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.get_bucket (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.list_file_buckets (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.update_bucket (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.delete_file_bucket (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.empty_bucket (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.access_bucket (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.upload (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.download (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.move (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.copy (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.remove (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.create_signed_url (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.create_signed_urls (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.create_signed_upload_url (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.upload_with_signed_url (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.update_file (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.file_exists (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.file_info (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.list_files_paginated (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.copy_cross_bucket (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.move_cross_bucket (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.upload_with_metadata (no symbols list — cannot confirm implementation exists)
• storage.file_buckets.url_cache_nonce (no symbols list — cannot confirm implementation exists)

These may have been renamed, removed, or never registered. Please update the capability matrix.
See: https://github.com/supabase/sdk/blob/main/docs/capability-matrix.md