Initial commit: 5 MCP servers for Mail, Calendar, Contacts, Files, Notes

Self-hosted MCP servers with OAuth client_credentials auth.
Each server connects to a different backend:
- Mail: reads Maildir IMAP backups
- Calendar/Tasks: CalDAV against Radicale
- Contacts: CardDAV against Radicale
- Files: WebDAV against oCIS
- Notes: Joplin REST API

Credentials externalized to config.json (not in repo).

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

config.json.example

@@ -0,0 +1,51 @@
+{
+  "radicale_url": "http://127.0.0.1:5232",
+  "radicale_users": {
+    "stefan": {
+      "username": "stefan",
+      "password": "CHANGE_ME"
+    },
+    "kati": {
+      "username": "kati",
+      "password": "CHANGE_ME"
+    }
+  },
+  "ocis_url": "http://127.0.0.1:9200",
+  "ocis_users": {
+    "stefan": {
+      "username": "stefan",
+      "password": "CHANGE_ME"
+    },
+    "kati": {
+      "username": "kati",
+      "password": "CHANGE_ME"
+    }
+  },
+  "joplin_url": "http://127.0.0.1:22300",
+  "joplin_tokens": {
+    "stefan": "",
+    "kati": ""
+  },
+  "mail_roots": {
+    "stefan": "/mnt/ssd/Backup/stefan/imap",
+    "kati": "/mnt/ssd/Backup/kati/imap"
+  },
+  "calendar_paths": {
+    "stefan": [
+      "/stefan/",
+      "/shared/"
+    ],
+    "kati": [
+      "/kati/",
+      "/shared/"
+    ]
+  },
+  "addressbook_paths": {
+    "stefan": [
+      "/stefan/"
+    ],
+    "kati": [
+      "/kati/"
+    ]
+  }
+}