feat: refactor agent tools management and add UI integration

- Added endpoint to list agent tools with metadata, excluding hidden tools.
- Updated NewChatRequest and RegenerateRequest schemas to include disabled tools.
- Integrated disabled tools management in the NewChatPage and Composer components.
- Improved tool instructions and visibility in the system prompt.
- Refactored tool registration to support hidden tools and default enabled states.
- Enhanced document chunk creation to handle strict zip behavior.
- Cleaned up imports and formatting across various files for consistency.

surfsense_backend/app/db.py

@@ -960,7 +960,10 @@ class Chunk(BaseModel, TimestampMixin):
     embedding = Column(Vector(config.embedding_model_instance.dimension))
 
     document_id = Column(
-        Integer, ForeignKey("documents.id", ondelete="CASCADE"), nullable=False, index=True
+        Integer,
+        ForeignKey("documents.id", ondelete="CASCADE"),
+        nullable=False,
+        index=True,
     )
     document = relationship("Document", back_populates="chunks")