fix(docker): Make port configuration consistent and dynamic

Fixed the mismatch between environment variables:
- docker-compose now passes PORT (what NestJS/Next.js read) instead of API_PORT
- API_PORT/WEB_PORT control host mapping, PORT controls container

Changes:
- docker-compose: Pass PORT=${API_PORT} and PORT=${WEB_PORT} to containers
- docker-compose: Dynamic port mapping on both host and container sides
- docker-compose: Traefik labels use ${API_PORT}/${WEB_PORT} variables
- docker-compose: Healthchecks use PORT env var
- Dockerfiles: Removed hardcoded port values
- Dockerfiles: Healthchecks read PORT at runtime

This allows changing ports via API_PORT/WEB_PORT environment variables
and have all components (app, healthcheck, Traefik) use the correct port.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '3.9'
+version: "3.9"
 
 services:
   # ======================
@@ -149,7 +149,15 @@ services:
       authentik-redis:
         condition: service_healthy
     healthcheck:
-      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:9000/-/health/live/"]
+      test:
+        [
+          "CMD",
+          "wget",
+          "--no-verbose",
+          "--tries=1",
+          "--spider",
+          "http://localhost:9000/-/health/live/",
+        ]
       interval: 30s
       timeout: 10s
       retries: 3
@@ -293,8 +301,8 @@ services:
     restart: unless-stopped
     environment:
       NODE_ENV: production
-      # API Configuration
-      API_PORT: ${API_PORT:-3001}
+      # API Configuration - PORT is what NestJS reads
+      PORT: ${API_PORT:-3001}
       API_HOST: ${API_HOST:-0.0.0.0}
       # Database
       DATABASE_URL: postgresql://${POSTGRES_USER:-mosaic}:${POSTGRES_PASSWORD:-mosaic_dev_password}@postgres:5432/${POSTGRES_DB:-mosaic}
@@ -311,14 +319,20 @@ services:
       # Ollama (optional)
       OLLAMA_ENDPOINT: ${OLLAMA_ENDPOINT:-http://ollama:11434}
     ports:
-      - "${API_PORT:-3001}:3001"
+      - "${API_PORT:-3001}:${API_PORT:-3001}"
     depends_on:
       postgres:
         condition: service_healthy
       valkey:
         condition: service_healthy
     healthcheck:
-      test: ["CMD", "node", "-e", "require('http').get('http://localhost:3001/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"]
+      test:
+        [
+          "CMD",
+          "sh",
+          "-c",
+          'node -e "require(''http'').get(''http://localhost:${PORT:-3001}/health'', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"',
+        ]
       interval: 30s
       timeout: 10s
       retries: 3
@@ -334,7 +348,7 @@ services:
       - "traefik.http.routers.mosaic-api.rule=Host(`${MOSAIC_API_DOMAIN:-api.mosaic.local}`)"
       - "traefik.http.routers.mosaic-api.entrypoints=${TRAEFIK_ENTRYPOINT:-websecure}"
       - "traefik.http.routers.mosaic-api.tls=${TRAEFIK_TLS_ENABLED:-true}"
-      - "traefik.http.services.mosaic-api.loadbalancer.server.port=3001"
+      - "traefik.http.services.mosaic-api.loadbalancer.server.port=${API_PORT:-3001}"
       - "traefik.docker.network=${TRAEFIK_DOCKER_NETWORK:-mosaic-public}"
       # Let's Encrypt (if enabled)
       - "traefik.http.routers.mosaic-api.tls.certresolver=${TRAEFIK_CERTRESOLVER:-}"
@@ -352,14 +366,21 @@ services:
     restart: unless-stopped
     environment:
       NODE_ENV: production
+      PORT: ${WEB_PORT:-3000}
       NEXT_PUBLIC_API_URL: ${NEXT_PUBLIC_API_URL:-http://localhost:3001}
     ports:
-      - "${WEB_PORT:-3000}:3000"
+      - "${WEB_PORT:-3000}:${WEB_PORT:-3000}"
     depends_on:
       api:
         condition: service_healthy
     healthcheck:
-      test: ["CMD", "node", "-e", "require('http').get('http://localhost:3000', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"]
+      test:
+        [
+          "CMD",
+          "sh",
+          "-c",
+          'node -e "require(''http'').get(''http://localhost:${PORT:-3000}'', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"',
+        ]
       interval: 30s
       timeout: 10s
       retries: 3
@@ -374,7 +395,7 @@ services:
       - "traefik.http.routers.mosaic-web.rule=Host(`${MOSAIC_WEB_DOMAIN:-mosaic.local}`)"
       - "traefik.http.routers.mosaic-web.entrypoints=${TRAEFIK_ENTRYPOINT:-websecure}"
       - "traefik.http.routers.mosaic-web.tls=${TRAEFIK_TLS_ENABLED:-true}"
-      - "traefik.http.services.mosaic-web.loadbalancer.server.port=3000"
+      - "traefik.http.services.mosaic-web.loadbalancer.server.port=${WEB_PORT:-3000}"
       - "traefik.docker.network=${TRAEFIK_DOCKER_NETWORK:-mosaic-public}"
       # Let's Encrypt (if enabled)
       - "traefik.http.routers.mosaic-web.tls.certresolver=${TRAEFIK_CERTRESOLVER:-}"