feat: implement TTS, Document processing, and Memory Service /facts API

- TTS: xtts-v2 integration with voice cloning support
- Document: docling integration for PDF/DOCX/PPTX processing
- Memory Service: added /facts/upsert, /facts/{key}, /facts endpoints
- Added required dependencies (TTS, docling)

services/memory-service/app/main.py

@@ -477,6 +477,102 @@ async def get_context(
     )
 
 
+# ============================================================================
+# FACTS (Simple Key-Value storage for Gateway compatibility)
+# ============================================================================
+
+from pydantic import BaseModel
+from typing import Any
+
+class FactUpsertRequest(BaseModel):
+    """Request to upsert a user fact"""
+    user_id: str
+    fact_key: str
+    fact_value: Optional[str] = None
+    fact_value_json: Optional[dict] = None
+    team_id: Optional[str] = None
+
+@app.post("/facts/upsert")
+async def upsert_fact(request: FactUpsertRequest):
+    """
+    Create or update a user fact.
+    
+    This is a simple key-value store for Gateway compatibility.
+    Facts are stored in PostgreSQL without vector indexing.
+    """
+    try:
+        # Ensure facts table exists (will be created on first call)
+        await db.ensure_facts_table()
+        
+        # Upsert the fact
+        result = await db.upsert_fact(
+            user_id=request.user_id,
+            fact_key=request.fact_key,
+            fact_value=request.fact_value,
+            fact_value_json=request.fact_value_json,
+            team_id=request.team_id
+        )
+        
+        logger.info(f"fact_upserted", user_id=request.user_id, fact_key=request.fact_key)
+        return {"status": "ok", "fact_id": result.get("fact_id") if result else None}
+        
+    except Exception as e:
+        logger.error(f"fact_upsert_failed", error=str(e), user_id=request.user_id)
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@app.get("/facts/{fact_key}")
+async def get_fact(
+    fact_key: str,
+    user_id: str = Query(...),
+    team_id: Optional[str] = None
+):
+    """Get a specific fact for a user"""
+    try:
+        fact = await db.get_fact(user_id=user_id, fact_key=fact_key, team_id=team_id)
+        if not fact:
+            raise HTTPException(status_code=404, detail="Fact not found")
+        return fact
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"fact_get_failed", error=str(e))
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@app.get("/facts")
+async def list_facts(
+    user_id: str = Query(...),
+    team_id: Optional[str] = None
+):
+    """List all facts for a user"""
+    try:
+        facts = await db.list_facts(user_id=user_id, team_id=team_id)
+        return {"facts": facts}
+    except Exception as e:
+        logger.error(f"facts_list_failed", error=str(e))
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@app.delete("/facts/{fact_key}")
+async def delete_fact(
+    fact_key: str,
+    user_id: str = Query(...),
+    team_id: Optional[str] = None
+):
+    """Delete a fact"""
+    try:
+        deleted = await db.delete_fact(user_id=user_id, fact_key=fact_key, team_id=team_id)
+        if not deleted:
+            raise HTTPException(status_code=404, detail="Fact not found")
+        return {"status": "ok", "deleted": True}
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"fact_delete_failed", error=str(e))
+        raise HTTPException(status_code=500, detail=str(e))
+
+
 # ============================================================================
 # ADMIN
 # ============================================================================