fix(security): path traversal, timing-safe auth, stale credential bindings

Security:
- Remove /mnt/ from _ALLOWED_LOG_PREFIXES to prevent Unraid share exposure
- Add early .. detection for disk/logs and live/log_tail path validation
- Add /boot/ prefix restriction for flash_backup source_path
- Use hmac.compare_digest for timing-safe API key verification in server.py
- Gate include_traceback on DEBUG log level (no tracebacks in production)

Correctness:
- Re-raise CredentialsNotConfiguredError in health check instead of swallowing
- Fix ups_device query (remove non-existent nominalPower/currentPower fields)

Best practices (BP-01, BP-05, BP-06):
- Add # noqa: ASYNC109 to timeout params in _handle_live and unraid()
- Fix start_array* → start_array in docstring (not in ARRAY_DESTRUCTIVE)
- Remove from __future__ import annotations from snapshot.py
- Replace import-time UNRAID_API_KEY/URL bindings with _settings.ATTR pattern
  in manager.py, snapshot.py, utils.py, diagnostics.py — fixes stale binding
  after apply_runtime_config() post-elicitation (BP-05)

CI/CD:
- Add .github/workflows/ci.yml (5-job pipeline: lint, typecheck, test, version-sync, audit)
- Add fail_under = 80 to [tool.coverage.report]
- Add version sync check to scripts/validate-marketplace.sh

Documentation:
- Sync plugin.json version 1.1.1 → 1.1.2 with pyproject.toml
- Update CLAUDE.md: 3 tools, system domain count 18, scripts comment fix
- Update README.md: 3 tools, security notes
- Update docs/AUTHENTICATION.md: H1 title fix
- Add UNRAID_CREDENTIALS_DIR to .env.example

Bump: 1.1.1 → 1.1.2

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

unraid_mcp/subscriptions/manager.py

@@ -15,8 +15,8 @@ from typing import Any
 import websockets
 from websockets.typing import Subprotocol
 
+from ..config import settings as _settings
 from ..config.logging import logger
-from ..config.settings import UNRAID_API_KEY
 from ..core.client import redact_sensitive
 from ..core.types import SubscriptionData
 from .utils import build_ws_ssl_context, build_ws_url
@@ -250,7 +250,7 @@ class SubscriptionManager:
                 ws_url = build_ws_url()
                 logger.debug(f"[WEBSOCKET:{subscription_name}] Connecting to: {ws_url}")
                 logger.debug(
-                    f"[WEBSOCKET:{subscription_name}] API Key present: {'Yes' if UNRAID_API_KEY else 'No'}"
+                    f"[WEBSOCKET:{subscription_name}] API Key present: {'Yes' if _settings.UNRAID_API_KEY else 'No'}"
                 )
 
                 ssl_context = build_ws_ssl_context(ws_url)
@@ -287,10 +287,10 @@ class SubscriptionManager:
                     init_type = "connection_init"
                     init_payload: dict[str, Any] = {"type": init_type}
 
-                    if UNRAID_API_KEY:
+                    if _settings.UNRAID_API_KEY:
                         logger.debug(f"[AUTH:{subscription_name}] Adding authentication payload")
                         # Use graphql-ws connectionParams format (direct key, not nested headers)
-                        init_payload["payload"] = {"x-api-key": UNRAID_API_KEY}
+                        init_payload["payload"] = {"x-api-key": _settings.UNRAID_API_KEY}
                     else:
                         logger.warning(
                             f"[AUTH:{subscription_name}] No API key available for authentication"