feat(F.17): add Coolify projects, databases, services — 67 tools total

Add 3 new Coolify plugin handlers (37 new tools, 67 total):
- projects.py: 8 tools (CRUD projects + environments)
- databases.py: 16 tools (CRUD, lifecycle, 6 DB types, backups)
- services.py: 13 tools (CRUD, lifecycle, env vars)

734 tests passing. Total platform tools: 633.

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

plugins/coolify/handlers/__init__.py

@@ -4,10 +4,13 @@ Coolify Plugin Handlers
 All tool handlers for Coolify operations.
 """
 
-from . import applications, deployments, servers
+from . import applications, databases, deployments, projects, servers, services
 
 __all__ = [
     "applications",
+    "databases",
     "deployments",
+    "projects",
     "servers",
+    "services",
 ]