fix(code-index): remove deprecated text-embedding-004 and migrate to gemini-embedding-001

[roomote]

This PR removes the deprecated text-embedding-004 model and adds automatic migration to gemini-embedding-001 for backward compatibility.

Changes

• Remove text-embedding-004 from model profiles: The text-embedding-004 entry has been removed from EMBEDDING_MODEL_PROFILES in embeddingModels.ts
• Add migration logic in GeminiEmbedder: Added a DEPRECATED_MODEL_MIGRATIONS map and migrateModelId() method that silently converts text-embedding-004 to gemini-embedding-001
• Update documentation: Updated comments in gemini.ts to reflect the supported model and migration behavior
• Update tests: Added new test case for the migration behavior

Why

The text-embedding-004 model is deprecated and should no longer be used. By adding automatic migration, users who have text-embedding-004 configured will continue to work without interruption - their requests are silently redirected to gemini-embedding-001.

Testing

• All existing tests pass
• Added new test to verify deprecated model migration works correctly
• TypeScript compilation passes
• Linting passes

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Important

Remove deprecated text-embedding-004 model and migrate to gemini-embedding-001 with backward compatibility in embeddingModels.ts and gemini.ts.

• Behavior:
  • Remove text-embedding-004 from EMBEDDING_MODEL_PROFILES in embeddingModels.ts.
  • Add DEPRECATED_MODEL_MIGRATIONS map and migrateModelId() in GeminiEmbedder to migrate text-embedding-004 to gemini-embedding-001.
  • Update comments in gemini.ts to reflect migration behavior.
• Tests:
  • Add test case in gemini.spec.ts to verify migration from text-embedding-004 to gemini-embedding-001.
  • Update service-factory.spec.ts to test migration logic in GeminiEmbedder.
  • Add tests in embeddingModels.spec.ts to ensure backward compatibility for dimension lookups.
• Misc:
  • Ensure text-embedding-004 is retained in EMBEDDING_MODEL_PROFILES for dimension lookup compatibility.

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[roomote]

Rooviewer   See task on Roo Cloud

Review completed. All previously flagged issues have been resolved. The new test file provides good coverage for the backward compatibility fix.

• Vector store dimension lookup breaks for migrated users - Fixed by keeping text-embedding-004 in EMBEDDING_MODEL_PROFILES with the correct dimension (3072) for backward-compatible dimension lookup.

Previous reviews

• 4335d9f: Review #1
• 4840a86: Review #2
• 4840a86: Review #3
• 8bae469: Review #4

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[roomote]

Removing text-embedding-004 from the profiles breaks the silent migration for users who have it configured. When createVectorStore() in service-factory.ts calls getModelDimension("gemini", "text-embedding-004"), it will return undefined because the model is no longer in the profiles, causing an error. The migration in GeminiEmbedder only affects embedder creation, not dimension lookup.

Consider either: (1) keeping text-embedding-004 in the profiles pointing to the migrated model's dimension (3072), or (2) exporting the migration logic from GeminiEmbedder and applying it in service-factory.ts before calling getModelDimension().

_{Fix it with Roo Code or mention @roomote and request a fix.}

[roomote]

Fixaroo   See task on Roo Cloud

Fixed the reported issue. All local checks passed.

_{View commit | Revert commit}

[roomote]

Rooviewer   See task on Roo Cloud

Review completed. The previously flagged issue remains unresolved.

• Vector store dimension lookup breaks for migrated users - Removing text-embedding-004 from EMBEDDING_MODEL_PROFILES causes createVectorStore() to fail for users with this model configured, since getModelDimension() returns undefined. The migration logic in GeminiEmbedder only covers embedder creation, not dimension lookup.

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[roomote]

Fixaroo   See task on Roo Cloud

Added tests to verify the dimension lookup fix for deprecated text-embedding-004 model. All local checks passed.

_{View commit | Revert commit}