feat: single-domain path-based routing (no subdomains required)

Move SPA assets from /assets/ to /_app/ (Vite assetsDir config) so
Traefik can route /assets/* to Logto without conflict. All services
on one hostname with path-based routing:

- /oidc/*, /interaction/*, /assets/* → Logto
- /server/* → server-ui (prefix stripped)
- /api/* → cameleer-saas
- /* (catch-all) → cameleer-saas SPA

Customer needs only 1 DNS record. Server gets OIDC_JWK_SET_URI for
Docker-internal JWK fetch (standard Spring split config).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -65,7 +65,7 @@ services:
     entrypoint: ["sh", "-c", "npm run cli db seed -- --swe && npm start"]
     environment:
       DB_URL: postgres://${POSTGRES_USER:-cameleer}:${POSTGRES_PASSWORD:-cameleer_dev}@postgres:5432/logto
-      ENDPOINT: ${PUBLIC_PROTOCOL:-https}://auth.${PUBLIC_HOST:-localhost}
+      ENDPOINT: ${PUBLIC_PROTOCOL:-https}://${PUBLIC_HOST:-localhost}
       ADMIN_ENDPOINT: http://${PUBLIC_HOST:-localhost}:3002
       TRUST_PROXY_HEADER: 1
     healthcheck:
@@ -76,7 +76,7 @@ services:
       start_period: 15s
     labels:
       - traefik.enable=true
-      - traefik.http.routers.logto.rule=Host(`auth.${PUBLIC_HOST:-localhost}`)
+      - traefik.http.routers.logto.rule=PathPrefix(`/oidc`) || PathPrefix(`/interaction`) || PathPrefix(`/assets`)
       - traefik.http.routers.logto.entrypoints=websecure
       - traefik.http.routers.logto.tls=true
       - traefik.http.services.logto.loadbalancer.server.port=3001
@@ -95,7 +95,7 @@ services:
     environment:
       LOGTO_ENDPOINT: http://logto:3001
       LOGTO_ADMIN_ENDPOINT: http://logto:3002
-      LOGTO_PUBLIC_ENDPOINT: ${PUBLIC_PROTOCOL:-https}://auth.${PUBLIC_HOST:-localhost}
+      LOGTO_PUBLIC_ENDPOINT: ${PUBLIC_PROTOCOL:-https}://${PUBLIC_HOST:-localhost}
       PUBLIC_HOST: ${PUBLIC_HOST:-localhost}
       PUBLIC_PROTOCOL: ${PUBLIC_PROTOCOL:-https}
       PG_HOST: postgres
@@ -133,8 +133,8 @@ services:
       SPRING_DATASOURCE_USERNAME: ${POSTGRES_USER:-cameleer}
       SPRING_DATASOURCE_PASSWORD: ${POSTGRES_PASSWORD:-cameleer_dev}
       LOGTO_ENDPOINT: ${LOGTO_ENDPOINT:-http://logto:3001}
-      LOGTO_PUBLIC_ENDPOINT: ${PUBLIC_PROTOCOL:-https}://auth.${PUBLIC_HOST:-localhost}
-      LOGTO_ISSUER_URI: ${PUBLIC_PROTOCOL:-https}://auth.${PUBLIC_HOST:-localhost}/oidc
+      LOGTO_PUBLIC_ENDPOINT: ${PUBLIC_PROTOCOL:-https}://${PUBLIC_HOST:-localhost}
+      LOGTO_ISSUER_URI: ${PUBLIC_PROTOCOL:-https}://${PUBLIC_HOST:-localhost}/oidc
       LOGTO_JWK_SET_URI: ${LOGTO_ENDPOINT:-http://logto:3001}/oidc/jwks
       LOGTO_M2M_CLIENT_ID: ${LOGTO_M2M_CLIENT_ID:-}
       LOGTO_M2M_CLIENT_SECRET: ${LOGTO_M2M_CLIENT_SECRET:-}
@@ -142,7 +142,12 @@ services:
       CLICKHOUSE_URL: jdbc:clickhouse://clickhouse:8123/cameleer
     labels:
       - traefik.enable=true
-      - traefik.http.routers.spa.rule=Host(`${PUBLIC_HOST:-localhost}`)
+      - traefik.http.routers.api.rule=PathPrefix(`/api`)
+      - traefik.http.routers.api.entrypoints=websecure
+      - traefik.http.routers.api.tls=true
+      - traefik.http.routers.api.service=spa
+      - traefik.http.routers.spa.rule=PathPrefix(`/`)
+      - traefik.http.routers.spa.priority=1
       - traefik.http.routers.spa.entrypoints=websecure
       - traefik.http.routers.spa.tls=true
       - traefik.http.services.spa.loadbalancer.server.port=8080
@@ -165,7 +170,8 @@ services:
       CAMELEER_AUTH_TOKEN: ${CAMELEER_AUTH_TOKEN:-default-bootstrap-token}
       CAMELEER_JWT_SECRET: ${CAMELEER_JWT_SECRET:-cameleer-dev-jwt-secret-change-in-production}
       CAMELEER_TENANT_ID: ${CAMELEER_TENANT_SLUG:-default}
-      CAMELEER_OIDC_ISSUER_URI: ${PUBLIC_PROTOCOL:-https}://auth.${PUBLIC_HOST:-localhost}/oidc
+      CAMELEER_OIDC_ISSUER_URI: ${PUBLIC_PROTOCOL:-https}://${PUBLIC_HOST:-localhost}/oidc
+      CAMELEER_OIDC_JWK_SET_URI: ${LOGTO_ENDPOINT:-http://logto:3001}/oidc/jwks
       CAMELEER_OIDC_AUDIENCE: ${CAMELEER_OIDC_AUDIENCE:-https://api.cameleer.local}
     healthcheck:
       test: ["CMD-SHELL", "curl -sf http://localhost:8081/api/v1/health || exit 1"]
@@ -196,9 +202,11 @@ services:
       CAMELEER_API_URL: http://cameleer3-server:8081
     labels:
       - traefik.enable=true
-      - traefik.http.routers.server-ui.rule=Host(`server.${PUBLIC_HOST:-localhost}`)
+      - traefik.http.routers.server-ui.rule=PathPrefix(`/server`)
       - traefik.http.routers.server-ui.entrypoints=websecure
       - traefik.http.routers.server-ui.tls=true
+      - traefik.http.routers.server-ui.middlewares=server-ui-strip
+      - traefik.http.middlewares.server-ui-strip.stripprefix.prefixes=/server
       - traefik.http.routers.server-ui.service=server-ui
       - traefik.http.services.server-ui.loadbalancer.server.port=80
     networks: