feat: add MCP server and profile management API

Add validation schemas (Zod), repository pattern with Prisma, service layer
with business logic (NotFoundError, ConflictError), and REST routes for
MCP server and profile CRUD. 86 mcpd tests passing.

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

.taskmaster/tasks/tasks.json

@@ -233,7 +233,7 @@
         "dependencies": [
           "3"
         ],
-        "status": "pending",
+        "status": "done",
         "subtasks": [
           {
             "id": 1,
@@ -294,7 +294,8 @@
             "testStrategy": "Write unit tests for seed functions. Security tests for injection prevention, authorization checks.",
             "parentId": "undefined"
           }
-        ]
+        ],
+        "updatedAt": "2026-02-21T04:26:06.239Z"
       },
       {
         "id": "5",
@@ -731,9 +732,9 @@
     ],
     "metadata": {
       "version": "1.0.0",
-      "lastModified": "2026-02-21T04:21:50.389Z",
+      "lastModified": "2026-02-21T04:26:06.239Z",
       "taskCount": 24,
-      "completedCount": 4,
+      "completedCount": 5,
       "tags": [
         "master"
       ]