feat: v0.5.0 — welle B Teil 1 (registry tools: search, tags, pull)

Three new SYNO.Docker.Registry tools, reverse-engineered from a live
DSM API capture (n4s4 reference disagrees on param names and methods).

- search_registry (#5): SYNO.Docker.Registry/search v1 with JSON-encoded
  q, plus offset/limit/page_size. Renders stars, downloads, official
  flag, truncated description, and total match count. Read-only.
- list_image_tags: SYNO.Docker.Registry/tags v1 with JSON-encoded repo
  (not name — DSM live capture diverges from n4s4). Response shape is
  unusual: tag list comes back as the envelope's data field directly.
  Output capped by limit (default 50); accepts both list and dict
  response shapes defensively. Read-only.
- pull_image (#3): SYNO.Docker.Registry/pull_start v1 with both
  repository and tag JSON-encoded. Async pull — no pull_status method
  confirmed on this DSM, so completion is detected by polling
  SYNO.Docker.Image/list (2–10 s backoff, 240 s budget under the
  Claude Desktop ~4 min tool-call ceiling). Timeout returns a
  non-fatal "still running" hint. Short-circuits when the image is
  already present locally. Confirmation gate required.

Tool count: 31 → 34. CLAUDE.md confirmation list updated. New DSM
quirks documented for pull_start (no pull_status) and tags (repo
param name, top-level data array).

Closes #3
Closes #5

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/mcp_synology_container/server.py

@@ -31,6 +31,7 @@ def create_server(config: AppConfig, client: DsmClient) -> FastMCP:
     from mcp_synology_container.modules.images import register_images
     from mcp_synology_container.modules.networks import register_networks
     from mcp_synology_container.modules.projects import register_projects
+    from mcp_synology_container.modules.registry import register_registry
     from mcp_synology_container.modules.system import register_system
 
     register_projects(mcp, config, client)
@@ -39,6 +40,7 @@ def create_server(config: AppConfig, client: DsmClient) -> FastMCP:
     register_images(mcp, config, client)
     register_system(mcp, config, client)
     register_networks(mcp, config, client)
+    register_registry(mcp, config, client)
 
     logger.info("MCP server configured with all tool modules")
     return mcp