docs(onboarding): improve new user experience + fix OpenPanel tools

- Add DOCKER_README.md for Docker Hub overview page
- Fix docker-compose.yaml port mapping for local users ("8000:8000")
- Add "Verify It Works" section with dashboard URL to README
- Restructure env.example with clear REQUIRED section
- Add post-Docker verification checklist to getting-started.md
- Fix 4 OpenPanel tools: parameter ordering (non-default before default)
- Rebrand all "Coolify Projects" to "MCP Hub" in server and Dockerfile
- Make MCP namespace prefix stripping generic

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

docker-compose.yaml

@@ -1,17 +1,16 @@
 # ===================================
 # MCP Hub — Docker Compose Configuration
 # ===================================
-# 
-# Build Pack: Docker Compose
-# ⚠️  CRITICAL RULES FOR COOLIFY:
-#   1. NO host port mappings: Use "8000" NOT "8000:8000"
-#   2. Listen on 0.0.0.0 (NOT localhost)
-#   3. Health checks for ALL services
-#   4. Use environment variables for ALL configs
+#
+# After starting:
+#   docker compose up -d
+#   curl http://localhost:8000/health    # verify server is running
+#   open http://localhost:8000/dashboard  # web dashboard
+#
+# For Coolify deployments:
+#   Change ports to "8000" (no host mapping) — Coolify handles routing.
 # ===================================
 
-version: '3.8'
-
 services:
   mcp-server:
     build:
@@ -19,11 +18,9 @@ services:
       dockerfile: Dockerfile
     container_name: mcphub
     restart: unless-stopped
-    
-    # ⚠️ CRITICAL: Only container port (NO host port mapping)
-    # Coolify will handle routing via domain
+
     ports:
-      - "8000"
+      - "8000:8000"
     
     # Environment variables
     environment: