Add stderr diagnostics and structured httpx timeout to dsm_client

- Write progress markers to stderr at each lazy-init step so Claude
  Desktop logs show exactly where a timeout occurs
- Replace flat timeout=30 integer with httpx.Timeout(connect=10,
  read=30, write=10, pool=5) to fail fast on connection issues
  instead of waiting up to 90 s across three sequential requests

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/mcp_synology_container/dsm_client.py

@@ -12,6 +12,7 @@ from __future__ import annotations
 
 import asyncio
 import logging
+import sys
 from typing import TYPE_CHECKING, Any
 
 import httpx
@@ -130,11 +131,19 @@ class DsmClient:
         async with self._init_lock:
             if self._initialized:  # re-check inside lock
                 return
+            sys.stderr.write(f"[dsm] Connecting to {self._base_url}...\n")
+            sys.stderr.flush()
             logger.debug("Lazy init: querying API info from %s", self._base_url)
             await self.query_api_info()
+            sys.stderr.write(f"[dsm] API info OK ({len(self._api_cache)} APIs)\n")
+            sys.stderr.flush()
             if self._auth_manager:
+                sys.stderr.write("[dsm] Authenticating...\n")
+                sys.stderr.flush()
                 logger.debug("Lazy init: authenticating")
                 self._sid = await self._auth_manager.login(self)
+                sys.stderr.write("[dsm] Auth OK\n")
+                sys.stderr.flush()
             self._initialized = True
             logger.debug("Lazy init complete")
 
@@ -143,7 +152,7 @@ class DsmClient:
         logging.getLogger("httpcore").setLevel(logging.WARNING)
         self._http = httpx.AsyncClient(
             verify=self._verify_ssl,
-            timeout=self._timeout,
+            timeout=httpx.Timeout(connect=10.0, read=float(self._timeout), write=10.0, pool=5.0),
         )
         return self
 
@@ -224,6 +233,8 @@ class DsmClient:
         Raises:
             SynologyError: On API errors.
         """
+        sys.stderr.write(f"[dsm] request: {api}/{method}\n")
+        sys.stderr.flush()
         await self._ensure_initialized()
         http = self._get_http()