feat: full node isolation - use node-specific swapper_url and router_url from DB

- Add migration 041_node_local_endpoints.sql
- Add get_node_endpoints() to repo_city.py
- Update routes_city.py to use DB endpoints instead of hardcoded URLs
- Update node-guardian-loop.py to use NODE_SWAPPER_URL/NODE_ROUTER_URL env vars
- Update launchd plist for NODE2 with router URL

migrations/041_node_local_endpoints.sql

@@ -0,0 +1,30 @@
+-- Migration: Add local endpoint URLs for each node
+-- Purpose: Allow each node to have its own Swapper and Router URLs for proper isolation
+
+-- Add endpoint columns to node_cache
+ALTER TABLE node_cache
+    ADD COLUMN IF NOT EXISTS router_url text,
+    ADD COLUMN IF NOT EXISTS swapper_url text;
+
+COMMENT ON COLUMN node_cache.router_url IS 'Full URL of DAGI Router for this node';
+COMMENT ON COLUMN node_cache.swapper_url IS 'Full URL of Swapper Service for this node';
+
+-- Set default values for NODE1 (Docker-based)
+UPDATE node_cache 
+SET 
+    router_url = 'http://dagi-router:9102',
+    swapper_url = 'http://swapper-service:8890'
+WHERE node_id = 'node-1-hetzner-gex44'
+  AND router_url IS NULL;
+
+-- Set default values for NODE2 (localhost-based)
+UPDATE node_cache 
+SET 
+    router_url = 'http://localhost:9102',
+    swapper_url = 'http://localhost:8890'
+WHERE node_id = 'node-2-macbook-m4max'
+  AND router_url IS NULL;
+
+-- Create index for faster lookups
+CREATE INDEX IF NOT EXISTS idx_node_cache_endpoints ON node_cache (node_id) WHERE router_url IS NOT NULL;
+