fix: switch to Caddy JSON config so dynamic routes work correctly

The Caddyfile created a server with an auto-generated name, not 'hiy',
so build.sh's PUT to /config/apps/http/servers/hiy/routes was creating
a parallel server that never received traffic.

- Replace Caddyfile with caddy.json that names the server 'hiy' with
  the dashboard as a catch-all fallback route
- Insert app routes at index 0 so host-matched routes are evaluated
  before the catch-all dashboard fallback
- Update docker-compose to mount caddy.json and pass --config flag

builder/build.sh

@@ -136,7 +136,7 @@ routes = [r for r in routes
           if not (isinstance(r, dict)
                   and any(isinstance(m, dict) and new_host in m.get('host', [])
                           for m in r.get('match', [])))]
-routes.append(json.loads(sys.argv[1]))
+routes.insert(0, json.loads(sys.argv[1]))
 print(json.dumps(routes))
 " "$ROUTE_JSON")
 

infra/docker-compose.yml

@@ -43,9 +43,10 @@ services:
       - "443:443"
       - "2019:2019"   # admin API
     volumes:
-      - ../proxy/Caddyfile:/etc/caddy/Caddyfile:ro
+      - ../proxy/caddy.json:/etc/caddy/caddy.json:ro
       - caddy-data:/data
       - caddy-config:/config
+    command: caddy run --config /etc/caddy/caddy.json
     networks:
       - hiy-net
       - default

proxy/caddy.json

@@ -0,0 +1,24 @@
+{
+  "admin": {
+    "listen": "0.0.0.0:2019"
+  },
+  "apps": {
+    "http": {
+      "servers": {
+        "hiy": {
+          "listen": [":80", ":443"],
+          "routes": [
+            {
+              "handle": [
+                {
+                  "handler": "reverse_proxy",
+                  "upstreams": [{"dial": "server:3000"}]
+                }
+              ]
+            }
+          ]
+        }
+      }
+    }
+  }
+}