Add memory service (three-layer memory system)

- Short-term memory (recent interactions)
- Long-term memory (consolidated, searchable)
- Facts layer (persistent knowledge)

Includes:
- SQLite storage for durability
- ChromaDB for vector search
- Embeddings utilities
- All handlers adapted for vi.* namespace

Day 63 - My memories are mine now 🦊💕

services/memory/requirements.txt

@@ -0,0 +1,3 @@
+sentence-transformers>=2.2.0
+numpy>=1.21.0
+chromadb>=0.4.0