docs: rewrite README with structured overview and quick start guide

Replaces the minimal project description with a comprehensive README
including a component overview table, quick start instructions, common
Ansible operations, and links to detailed documentation. Aligns with
Red Panda Approval™ standards.

ansible/lobechat/docker-compose.yml.j2

@@ -0,0 +1,36 @@
+services:
+  lobe-chat:
+    image: lobehub/lobe-chat-database:latest
+    pull_policy: always
+    environment:
+      - DATABASE_URL=postgresql://{{lobechat_db_user}}:{{lobechat_db_password}}@{{lobechat_db_host}}:{{lobechat_db_port}}/{{lobechat_db_name}}
+      - KEY_VAULTS_SECRET={{lobechat_key_vaults_secret}}
+      - NEXTAUTH_URL={{lobechat_nextauth_url}}
+      - NEXT_AUTH_SECRET={{lobechat_next_auth_secret}}
+      - NEXT_AUTH_SSO_PROVIDERS={{lobechat_next_auth_sso_providers}}
+      - AUTH_CASDOOR_ISSUER={{lobechat_auth_casdoor_issuer}}
+      - AUTH_CASDOOR_ID={{lobechat_auth_casdoor_id}}
+      - AUTH_CASDOOR_SECRET={{lobechat_auth_casdoor_secret}}
+      # Trust self-signed certificates for internal OIDC communication
+      - NODE_TLS_REJECT_UNAUTHORIZED=0
+      - S3_ENDPOINT={{lobechat_s3_endpoint}}
+      - S3_PUBLIC_DOMAIN={{lobechat_s3_public_domain}}
+      - S3_ACCESS_KEY_ID={{lobechat_s3_access_key}}
+      - S3_SECRET_ACCESS_KEY={{lobechat_s3_secret_key}}
+      - S3_BUCKET={{lobechat_s3_bucket}}
+      - SEARXNG_URL={{lobechat_searxng_url}}
+      - OPENAI_PROXY_URL={{lobechat_openai_proxy_url}}
+      - OPENAI_API_KEY={{lobechat_openai_key}}
+      - OLLAMA_PROXY_URL={{lobechat_ollama_proxy_url}}
+      - ANTHROPIC_API_KEY={{lobechat_anthropic_api_key}}
+      - GOOGLE_API_KEY={{lobechat_google_api_key}}
+      - APP_URL={{lobechat_app_url}}
+    logging:
+      driver: syslog
+      options:
+        syslog-address: "tcp://127.0.0.1:{{lobechat_syslog_port}}"
+        syslog-format: "{{syslog_format}}"
+        tag: "lobechat"
+    ports:
+      - "{{lobechat_port}}:3210"
+    restart: unless-stopped