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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PRRT_kwDOO6Hdxs5uu70e, PRRT_kwDOO6Hdxs5uu70i, PRRT_kwDOO6Hdxs5uu7zn,
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PRRT_kwDOO6Hdxs5uu7Tv, PRRT_kwDOO6Hdxs5uu7Tw, PRRT_kwDOO6Hdxs5uu7Tx

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>

tests/test_storage.py

@@ -60,6 +60,15 @@ class TestStorageValidation:
         with pytest.raises(ToolError, match="log_path must start with"):
             await tool_fn(action="logs", log_path="/etc/shadow")
 
+    async def test_logs_rejects_path_traversal(self, _mock_graphql: AsyncMock) -> None:
+        tool_fn = _make_tool()
+        # Traversal that escapes /var/log/ to reach /etc/shadow
+        with pytest.raises(ToolError, match="log_path must start with"):
+            await tool_fn(action="logs", log_path="/var/log/../../etc/shadow")
+        # Traversal that escapes /mnt/ to reach /etc/passwd
+        with pytest.raises(ToolError, match="log_path must start with"):
+            await tool_fn(action="logs", log_path="/mnt/../etc/passwd")
+
     async def test_logs_allows_valid_paths(self, _mock_graphql: AsyncMock) -> None:
         _mock_graphql.return_value = {"logFile": {"path": "/var/log/syslog", "content": "ok"}}
         tool_fn = _make_tool()