Joplin via Data API + Mail attachments

Notes server rewritten to use Joplin CLI Data API (joplin-cli sync
clients on host, ports 41184/41185). Clean fast search, proper
resource handling. New tools: list_note_resources, read_resource
(attachments as inline image/document/text).

Mail server: read_mail now lists attachments; new read_attachment
tool returns images inline, PDFs/docs as EmbeddedResource, text directly.

Tests: 54 total. Notes now real (notebooks, list, create+read).
Mail attachment listing + fetch tested.

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

config.json.example

@@ -47,5 +47,15 @@
     "kati": [
       "/kati/"
     ]
+  },
+  "joplin_data_api": {
+    "stefan": {
+      "url": "http://127.0.0.1:41184",
+      "token": "CHANGE_ME"
+    },
+    "kati": {
+      "url": "http://127.0.0.1:41185",
+      "token": "CHANGE_ME"
+    }
   }
 }