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_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>

unraid_mcp/tools/storage.py

@@ -4,6 +4,7 @@ Provides the `unraid_storage` tool with 6 actions for shares, physical disks,
 unassigned devices, log files, and log content retrieval.
 """
 
+import posixpath
 from typing import Any, Literal
 
 from fastmcp import FastMCP
@@ -99,11 +100,14 @@ def register_storage_tool(mcp: FastMCP) -> None:
             if not log_path:
                 raise ToolError("log_path is required for 'logs' action")
             _ALLOWED_LOG_PREFIXES = ("/var/log/", "/boot/logs/", "/mnt/")
-            if not any(log_path.startswith(p) for p in _ALLOWED_LOG_PREFIXES):
+            # Normalize path to prevent traversal attacks (e.g. /var/log/../../etc/shadow)
+            normalized = posixpath.normpath(log_path)
+            if not any(normalized.startswith(p) for p in _ALLOWED_LOG_PREFIXES):
                 raise ToolError(
                     f"log_path must start with one of: {', '.join(_ALLOWED_LOG_PREFIXES)}. "
                     f"Use log_files action to discover valid paths."
                 )
+            log_path = normalized
 
         query = QUERIES[action]
         variables: dict[str, Any] | None = None