R1: Dashboard 500 fix, Phase 2/7 uncommitted changes

- Fix dashboard 500 when deps disconnected — _gather_state() now returns
  full defaults instead of bare {'connected': False}
- Phase 2: FX param schemas aligned with DSP implementations
- Phase 7: Pipeline routing, preset manager improvements
- Factory presets: cleanup and normalization

Fixes dashboard crash on disconnected state (dogfood issue #1)

src/web/server.py

@@ -1004,7 +1004,21 @@ class WebServer:
         ir = self.deps.ir_loader
 
         if not pm:
-            return {"connected": False}
+            return {
+                "connected": False,
+                "current_preset": None,
+                "bypass": False,
+                "tuner_enabled": False,
+                "master_volume": 0.8,
+                "routing_mode": "mono",
+                "routing_breakpoint": 7,
+                "nam_loaded": False,
+                "nam_model": None,
+                "ir_loaded": False,
+                "ir_name": None,
+                "wifi": {},
+                "bluetooth": {},
+            }
 
         try:
             bank = pm.current_bank