feat(developer): add hybrid iframe integration for developer tools

Replace placeholder pages with ToolEmbed component that embeds
LangGraph, LangFlow, and Langfuse in iframes when configured, or
shows "Not Configured" placeholders when URLs are empty. Add
ServiceUrlsContext for passing service URLs through Dioxus context.

Add docker-compose services for local development: LangFlow,
LangGraph (trial), Langfuse with full dependency stack (Postgres,
ClickHouse, Redis, MinIO).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -94,5 +94,155 @@ services:
       - ./librechat/openidStrategy.js:/app/api/strategies/openidStrategy.js:ro
       - librechat-data:/app/data
 
+  langflow:
+    image: langflowai/langflow:latest
+    container_name: certifai-langflow
+    restart: unless-stopped
+    ports:
+      - "7860:7860"
+    environment:
+      LANGFLOW_AUTO_LOGIN: "true"
+
+  langgraph:
+    image: langchain/langgraph-trial:3.12
+    container_name: certifai-langgraph
+    restart: unless-stopped
+    depends_on:
+      langgraph-db:
+        condition: service_started
+      langgraph-redis:
+        condition: service_started
+    ports:
+      - "8123:8000"
+    environment:
+      DATABASE_URI: postgresql://langgraph:langgraph@langgraph-db:5432/langgraph
+      REDIS_URI: redis://langgraph-redis:6379
+
+  langgraph-db:
+    image: postgres:16
+    container_name: certifai-langgraph-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: langgraph
+      POSTGRES_PASSWORD: langgraph
+      POSTGRES_DB: langgraph
+    volumes:
+      - langgraph-db-data:/var/lib/postgresql/data
+
+  langgraph-redis:
+    image: redis:7-alpine
+    container_name: certifai-langgraph-redis
+    restart: unless-stopped
+
+  langfuse:
+    image: langfuse/langfuse:3
+    container_name: certifai-langfuse
+    restart: unless-stopped
+    depends_on:
+      langfuse-db:
+        condition: service_healthy
+      langfuse-clickhouse:
+        condition: service_healthy
+      langfuse-redis:
+        condition: service_healthy
+      langfuse-minio:
+        condition: service_healthy
+    ports:
+      - "3000:3000"
+    environment:
+      DATABASE_URL: postgresql://langfuse:langfuse@langfuse-db:5432/langfuse
+      NEXTAUTH_URL: http://localhost:3000
+      NEXTAUTH_SECRET: certifai-langfuse-dev-secret
+      SALT: certifai-langfuse-dev-salt
+      ENCRYPTION_KEY: "0000000000000000000000000000000000000000000000000000000000000000"
+      CLICKHOUSE_URL: http://langfuse-clickhouse:8123
+      CLICKHOUSE_MIGRATION_URL: clickhouse://langfuse-clickhouse:9000
+      CLICKHOUSE_USER: clickhouse
+      CLICKHOUSE_PASSWORD: clickhouse
+      CLICKHOUSE_CLUSTER_ENABLED: "false"
+      REDIS_HOST: langfuse-redis
+      REDIS_PORT: "6379"
+      REDIS_AUTH: langfuse-dev-redis
+      LANGFUSE_S3_EVENT_UPLOAD_BUCKET: langfuse
+      LANGFUSE_S3_EVENT_UPLOAD_REGION: auto
+      LANGFUSE_S3_EVENT_UPLOAD_ACCESS_KEY_ID: minio
+      LANGFUSE_S3_EVENT_UPLOAD_SECRET_ACCESS_KEY: miniosecret
+      LANGFUSE_S3_EVENT_UPLOAD_ENDPOINT: http://langfuse-minio:9000
+      LANGFUSE_S3_EVENT_UPLOAD_FORCE_PATH_STYLE: "true"
+      LANGFUSE_S3_MEDIA_UPLOAD_BUCKET: langfuse
+      LANGFUSE_S3_MEDIA_UPLOAD_REGION: auto
+      LANGFUSE_S3_MEDIA_UPLOAD_ACCESS_KEY_ID: minio
+      LANGFUSE_S3_MEDIA_UPLOAD_SECRET_ACCESS_KEY: miniosecret
+      LANGFUSE_S3_MEDIA_UPLOAD_ENDPOINT: http://langfuse-minio:9000
+      LANGFUSE_S3_MEDIA_UPLOAD_FORCE_PATH_STYLE: "true"
+
+  langfuse-db:
+    image: postgres:16
+    container_name: certifai-langfuse-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: langfuse
+      POSTGRES_PASSWORD: langfuse
+      POSTGRES_DB: langfuse
+    volumes:
+      - langfuse-db-data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U langfuse"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  langfuse-clickhouse:
+    image: clickhouse/clickhouse-server:latest
+    container_name: certifai-langfuse-clickhouse
+    restart: unless-stopped
+    user: "101:101"
+    environment:
+      CLICKHOUSE_DB: default
+      CLICKHOUSE_USER: clickhouse
+      CLICKHOUSE_PASSWORD: clickhouse
+    ulimits:
+      nofile:
+        soft: 262144
+        hard: 262144
+    volumes:
+      - langfuse-clickhouse-data:/var/lib/clickhouse
+      - langfuse-clickhouse-logs:/var/log/clickhouse-server
+    healthcheck:
+      test: ["CMD-SHELL", "wget --no-verbose --tries=1 --spider http://localhost:8123/ping || exit 1"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  langfuse-redis:
+    image: redis:7-alpine
+    container_name: certifai-langfuse-redis
+    restart: unless-stopped
+    command: redis-server --requirepass langfuse-dev-redis
+    healthcheck:
+      test: ["CMD", "redis-cli", "-a", "langfuse-dev-redis", "ping"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  langfuse-minio:
+    image: cgr.dev/chainguard/minio
+    container_name: certifai-langfuse-minio
+    restart: unless-stopped
+    entrypoint: sh
+    command: -c 'mkdir -p /data/langfuse && minio server --address ":9000" --console-address ":9001" /data'
+    environment:
+      MINIO_ROOT_USER: minio
+      MINIO_ROOT_PASSWORD: miniosecret
+    healthcheck:
+      test: ["CMD-SHELL", "mc ready local || exit 1"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
 volumes:
   librechat-data:
+  langgraph-db-data:
+  langfuse-db-data:
+  langfuse-clickhouse-data:
+  langfuse-clickhouse-logs: