Add video impacts

[samuelrince]

Summary

Adds EcoLogits video impact estimation support to the v1beta API and upgrades EcoLogits to 0.11.0.

Changes

• Add video generation endpoints:
  • GET /v1beta/video-providers
  • GET /v1beta/video-models/{provider}
  • POST /v1beta/video-estimations
• Add OpenAPI response examples and tag metadata for video catalog and video estimations.
• Update LLM estimations to support provider-qualified model names like openai/gpt-5.
• Make provider optional when it can be inferred from model_name.
• Add datacenter_location as the preferred location field.
• Deprecate electricity_mix_zone while preserving backward compatibility.
• Update API description docs to distinguish LLM and video endpoint families.
• Expand router tests for video endpoints, qualified model names, datacenter location behavior, and validation cases.