feat: Enhance CodexLens search functionality with new parameters and result handling

- Added search limit, content length, and extra files input fields in the CodexLens manager UI.
- Updated API request parameters to include new fields: max_content_length and extra_files_count.
- Refactored smart-search.ts to support new parameters with default values.
- Implemented result splitting logic to return both full content and additional file paths.
- Updated CLI commands to remove worker limits and allow dynamic scaling based on endpoint count.
- Introduced EmbeddingPoolConfig for improved embedding management and auto-discovery of providers.
- Enhanced search engines to utilize new parameters for fuzzy and exact searches.
- Added support for embedding single texts in the LiteLLM embedder.

codex-lens/src/codexlens/semantic/litellm_embedder.py

@@ -127,3 +127,18 @@ class LiteLLMEmbedderWrapper(BaseEmbedder):
 
         # LiteLLM handles batching internally, ignore batch_size parameter
         return self._embedder.embed(texts)
+
+    def embed_single(self, text: str) -> list[float]:
+        """Generate embedding for a single text.
+
+        Args:
+            text: Text to embed.
+
+        Returns:
+            list[float]: Embedding vector as a list of floats.
+        """
+        # Sanitize text before embedding
+        sanitized = self._sanitize_text(text)
+        embedding = self._embedder.embed([sanitized])
+        return embedding[0].tolist()
+