feat: Implement CodexLens multi-provider embedding rotation management

- Added functions to get and update CodexLens embedding rotation configuration.
- Introduced functionality to retrieve enabled embedding providers for rotation.
- Created endpoints for managing rotation configuration via API.
- Enhanced dashboard UI to support multi-provider rotation configuration.
- Updated internationalization strings for new rotation features.
- Adjusted CLI commands and embedding manager to support increased concurrency limits.
- Modified hybrid search weights for improved ranking behavior.

codex-lens/tests/test_hybrid_search_e2e.py

@@ -45,9 +45,9 @@ class TestHybridSearchBasics:
         """Test HybridSearchEngine initializes with default weights."""
         engine = HybridSearchEngine()
         assert engine.weights == HybridSearchEngine.DEFAULT_WEIGHTS
-        assert engine.weights["exact"] == 0.4
-        assert engine.weights["fuzzy"] == 0.3
-        assert engine.weights["vector"] == 0.3
+        assert engine.weights["exact"] == 0.3
+        assert engine.weights["fuzzy"] == 0.1
+        assert engine.weights["vector"] == 0.6
 
     def test_engine_custom_weights(self):
         """Test HybridSearchEngine accepts custom weights."""