feat(models): skip install-time pull; hardware-aware picks in Models tab

Windows installer no longer auto-downloads models; points to the Models tab.
synapse/hardware.py detects RAM + best-effort VRAM and a curated catalog;
GET /models/recommended annotates each model with fit (gpu/ram/no); the Models
page shows detected RAM/VRAM with fit badges and per-row Pull buttons.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

synapse/main.py

@@ -621,6 +621,13 @@ async def reorder_memory(payload: Dict[str, Any] = Body(...)):
 # -------------------------
 # Models
 # -------------------------
+@app.get("/models/recommended")
+async def models_recommended():
+    """Curated models annotated with whether they fit this machine's VRAM/RAM."""
+    from . import hardware
+    return hardware.recommend()
+
+
 @app.get("/models")
 async def get_models():
     try: