feat: Initial confluence-mcp server for realtime collaboration

Provides 8 MCP tools for Confluence Cloud:
- confluence_list_spaces, confluence_create_space
- confluence_search, confluence_get_page
- confluence_create_page, confluence_update_page
- confluence_get_comments, confluence_add_comment

Uses Confluence REST API v2 with basic auth.
Registered in Claude Code and mcp-proxy.

Refs: CF-935

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

node_modules/jose/dist/webapi/lib/iv.js

@@ -0,0 +1,19 @@
+import { JOSENotSupported } from '../util/errors.js';
+export function bitLength(alg) {
+    switch (alg) {
+        case 'A128GCM':
+        case 'A128GCMKW':
+        case 'A192GCM':
+        case 'A192GCMKW':
+        case 'A256GCM':
+        case 'A256GCMKW':
+            return 96;
+        case 'A128CBC-HS256':
+        case 'A192CBC-HS384':
+        case 'A256CBC-HS512':
+            return 128;
+        default:
+            throw new JOSENotSupported(`Unsupported JWE Algorithm: ${alg}`);
+    }
+}
+export const generateIv = (alg) => crypto.getRandomValues(new Uint8Array(bitLength(alg) >> 3));