fix: address 18 CRITICAL+HIGH PR review comments

**Critical Fixes (7 issues):**
- Fix GraphQL schema field names in users tool (role→roles, remove email)
- Fix GraphQL mutation signatures (addUserInput, deleteUser input)
- Fix dict(None) TypeError guards in users tool (use `or {}` pattern)
- Fix FastAPI version constraint (0.116.1→0.115.0)
- Fix WebSocket SSL context handling (support CA bundles, bool, and None)
- Fix critical disk threshold treated as warning (split counters)

**High Priority Fixes (11 issues):**
- Fix Docker update/remove action response field mapping
- Fix path traversal vulnerability in log validation (normalize paths)
- Fix deleteApiKeys validation (check response before success)
- Fix rclone create_remote validation (check response)
- Fix keys input_data type annotation (dict[str, Any])
- Fix VM domain/domains fallback restoration

**Changes by file:**
- unraid_mcp/tools/docker.py: Response field mapping
- unraid_mcp/tools/info.py: Split critical/warning counters
- unraid_mcp/tools/storage.py: Path normalization for traversal protection
- unraid_mcp/tools/users.py: GraphQL schema + null handling
- unraid_mcp/tools/keys.py: Validation + type annotations
- unraid_mcp/tools/rclone.py: Response validation
- unraid_mcp/tools/virtualization.py: Domain fallback
- unraid_mcp/subscriptions/manager.py: SSL context creation
- pyproject.toml: FastAPI version fix
- tests/*: New tests for all fixes

**Review threads resolved:**
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All tests passing.

Co-authored-by: docker-fixer <agent@pr-fixes>
Co-authored-by: info-fixer <agent@pr-fixes>
Co-authored-by: storage-fixer <agent@pr-fixes>
Co-authored-by: users-fixer <agent@pr-fixes>
Co-authored-by: config-fixer <agent@pr-fixes>
Co-authored-by: websocket-fixer <agent@pr-fixes>
Co-authored-by: keys-rclone-fixer <agent@pr-fixes>
Co-authored-by: vm-fixer <agent@pr-fixes>

unraid_mcp/tools/virtualization.py

@@ -105,15 +105,16 @@ def register_vm_tool(mcp: FastMCP) -> None:
 
             if action == "list":
                 data = await make_graphql_request(QUERIES["list"])
-                if data.get("vms") and data["vms"].get("domains"):
-                    vms = data["vms"]["domains"]
-                    return {"vms": list(vms) if isinstance(vms, list) else []}
+                if data.get("vms"):
+                    vms = data["vms"].get("domains") or data["vms"].get("domain")
+                    if vms:
+                        return {"vms": list(vms) if isinstance(vms, list) else []}
                 return {"vms": []}
 
             if action == "details":
                 data = await make_graphql_request(QUERIES["details"])
                 if data.get("vms"):
-                    vms = data["vms"].get("domains") or []
+                    vms = data["vms"].get("domains") or data["vms"].get("domain") or []
                     for vm in vms:
                         if (
                             vm.get("uuid") == vm_id