docs: add env.example template for new users

Previously excluded from community edition by mistake.
This template has placeholder values only (no real secrets)
and is needed for the Quick Start: `cp env.example .env`

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

env.example

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+# ===================================
+# MCP Hub — Environment Configuration
+# ===================================
+#
+# MINIMUM TO START: Just set MASTER_API_KEY and one site below.
+# Full docs: https://github.com/airano-ir/mcphub/blob/main/docs/getting-started.md
+#
+# After editing, run:
+#   docker compose up -d
+#   curl http://localhost:8000/health       # verify server
+#   open http://localhost:8000/dashboard     # web dashboard
+# ===================================
+
+# ============================================
+# REQUIRED
+# ============================================
+
+# Master API key for authentication (also used to log into the dashboard)
+# Generate with: python -c "import secrets; print(secrets.token_urlsafe(32))"
+MASTER_API_KEY=your-secure-key-here
+
+# ============================================
+# WORDPRESS SITES
+# ============================================
+# Pattern: WORDPRESS_{SITE_ID}_{CONFIG_KEY}
+# Add as many sites as you want (SITE1, SITE2, SITE3, ...)
+#
+# How to create a WordPress Application Password:
+#   1. Log into WordPress admin → Users → Your Profile
+#   2. Scroll to "Application Passwords" section
+#   3. Enter name "MCP Hub" → click "Add New"
+#   4. Copy the generated password (format: xxxx xxxx xxxx xxxx)
+
+WORDPRESS_SITE1_URL=https://your-site.com
+WORDPRESS_SITE1_USERNAME=admin
+WORDPRESS_SITE1_APP_PASSWORD=xxxx xxxx xxxx xxxx
+WORDPRESS_SITE1_ALIAS=mysite
+
+# Optional: Docker container name for WP-CLI tools (cache flush, transients, etc.)
+# Find with: docker ps --filter name=wordpress
+# WORDPRESS_SITE1_CONTAINER=wordpress-container-name
+
+# Second site example (uncomment to use):
+# WORDPRESS_SITE2_URL=https://another-site.com
+# WORDPRESS_SITE2_USERNAME=admin
+# WORDPRESS_SITE2_APP_PASSWORD=yyyy yyyy yyyy yyyy
+# WORDPRESS_SITE2_ALIAS=blog
+
+# ============================================
+# WOOCOMMERCE STORES
+# ============================================
+# Pattern: WOOCOMMERCE_{STORE_ID}_{CONFIG_KEY}
+# WooCommerce is a separate plugin — uses Consumer Key/Secret, not App Passwords.
+#
+# Create keys: WooCommerce → Settings → Advanced → REST API → Add Key
+
+# WOOCOMMERCE_STORE1_URL=https://your-store.com
+# WOOCOMMERCE_STORE1_CONSUMER_KEY=ck_xxxxx
+# WOOCOMMERCE_STORE1_CONSUMER_SECRET=cs_xxxxx
+# WOOCOMMERCE_STORE1_ALIAS=mystore
+
+# ============================================
+# OTHER PLUGINS (uncomment to use)
+# ============================================
+# All plugins auto-discover their environment variables at startup.
+# Pattern: {PLUGIN_TYPE}_{INSTANCE_ID}_{CONFIG_KEY}
+
+# --- Gitea ---
+# GITEA_REPO1_URL=https://git.example.com
+# GITEA_REPO1_TOKEN=your_gitea_token
+# GITEA_REPO1_ALIAS=mygitea
+
+# --- n8n ---
+# N8N_INSTANCE1_URL=https://n8n.example.com
+# N8N_INSTANCE1_API_KEY=your_n8n_api_key
+# N8N_INSTANCE1_ALIAS=myn8n
+
+# --- Supabase ---
+# SUPABASE_PROJECT1_URL=https://xxxxx.supabase.co
+# SUPABASE_PROJECT1_API_KEY=your_supabase_api_key
+# SUPABASE_PROJECT1_SERVICE_ROLE=your_service_role_key
+# SUPABASE_PROJECT1_ALIAS=mysupabase
+
+# --- OpenPanel ---
+# OPENPANEL_INSTANCE1_URL=https://openpanel.example.com
+# OPENPANEL_INSTANCE1_CLIENT_ID=your_client_id
+# OPENPANEL_INSTANCE1_CLIENT_SECRET=your_client_secret
+# OPENPANEL_INSTANCE1_ALIAS=myopenpanel
+
+# --- Appwrite ---
+# APPWRITE_PROJECT1_URL=https://appwrite.example.com
+# APPWRITE_PROJECT1_API_KEY=your_appwrite_api_key
+# APPWRITE_PROJECT1_PROJECT_ID=your_project_id
+# APPWRITE_PROJECT1_ALIAS=myappwrite
+
+# --- Directus ---
+# DIRECTUS_INSTANCE1_URL=https://directus.example.com
+# DIRECTUS_INSTANCE1_TOKEN=your_directus_token
+# DIRECTUS_INSTANCE1_ALIAS=mydirectus
+
+# ============================================
+# OAUTH (optional — for ChatGPT/Claude auto-registration)
+# ============================================
+# Only needed if you want ChatGPT or Claude to auto-register via OAuth.
+# For local testing with API key auth, you can skip these.
+
+# OAUTH_JWT_SECRET_KEY=your-jwt-secret
+# OAUTH_BASE_URL=https://your-public-domain.com
+
+# ============================================
+# ADVANCED (optional — defaults are fine)
+# ============================================
+
+# Logging
+LOG_LEVEL=INFO
+
+# Rate limits (per client)
+# RATE_LIMIT_PER_MINUTE=60
+# RATE_LIMIT_PER_HOUR=1000
+# RATE_LIMIT_PER_DAY=10000