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/is_disjoint.js

@@ -0,0 +1,21 @@
+export function isDisjoint(...headers) {
+    const sources = headers.filter(Boolean);
+    if (sources.length === 0 || sources.length === 1) {
+        return true;
+    }
+    let acc;
+    for (const header of sources) {
+        const parameters = Object.keys(header);
+        if (!acc || acc.size === 0) {
+            acc = new Set(parameters);
+            continue;
+        }
+        for (const parameter of parameters) {
+            if (acc.has(parameter)) {
+                return false;
+            }
+            acc.add(parameter);
+        }
+    }
+    return true;
+}