docs: fix tool counts (596→565), update live URL, clean Docker README

- Fix tool count: 596→565 (OpenPanel reduced from 73→42 in v3.4.0)
- Update DOCKER_README: dashboard-first site configuration
- Update .env.example version to 3.4.0

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

.env.example

@@ -2,8 +2,8 @@
 # MCP Hub - Environment Configuration
 # ==============================================================================
 #
-# Version: 3.0.0
-# Last Updated: 2026-02-17
+# Version: 3.4.0
+# Last Updated: 2026-04-02
 #
 # This file contains environment variables needed to run the MCP server.
 # Copy this file to .env and fill in your actual values.
@@ -14,7 +14,7 @@
 # SECURITY NOTE: Never commit .env file to version control!
 #
 # Multi-Endpoint Architecture (v3.0.0):
-# - /mcp                    → Admin (all 587 tools, Master API Key required)
+# - /mcp                    → Admin (all 565 tools, Master API Key required)
 # - /system/mcp             → System (17 tools, Master Key)
 # - /wordpress/mcp          → WordPress Core (65 tools)
 # - /woocommerce/mcp        → WooCommerce (28 tools)
@@ -22,7 +22,7 @@
 # - /gitea/mcp              → Gitea (56 tools)
 # - /n8n/mcp                → n8n Automation (56 tools)
 # - /supabase/mcp           → Supabase Self-Hosted (70 tools)
-# - /openpanel/mcp          → OpenPanel Analytics (73 tools)
+# - /openpanel/mcp          → OpenPanel Analytics (42 tools)
 # - /appwrite/mcp           → Appwrite Backend (100 tools)
 # - /directus/mcp           → Directus CMS (100 tools)
 # - /project/{alias}/mcp    → Project-specific (site-locked tools)