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/check_key_length.js

@@ -0,0 +1,8 @@
+export function checkKeyLength(alg, key) {
+    if (alg.startsWith('RS') || alg.startsWith('PS')) {
+        const { modulusLength } = key.algorithm;
+        if (typeof modulusLength !== 'number' || modulusLength < 2048) {
+            throw new TypeError(`${alg} requires key modulusLength to be 2048 bits or larger`);
+        }
+    }
+}