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/validate_algorithms.js

@@ -0,0 +1,10 @@
+export function validateAlgorithms(option, algorithms) {
+    if (algorithms !== undefined &&
+        (!Array.isArray(algorithms) || algorithms.some((s) => typeof s !== 'string'))) {
+        throw new TypeError(`"${option}" option must be an array of strings`);
+    }
+    if (!algorithms) {
+        return undefined;
+    }
+    return new Set(algorithms);
+}