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/util/decode_jwt.js

@@ -0,0 +1,32 @@
+import { decode as b64u } from './base64url.js';
+import { decoder } from '../lib/buffer_utils.js';
+import { isObject } from '../lib/is_object.js';
+import { JWTInvalid } from './errors.js';
+export function decodeJwt(jwt) {
+    if (typeof jwt !== 'string')
+        throw new JWTInvalid('JWTs must use Compact JWS serialization, JWT must be a string');
+    const { 1: payload, length } = jwt.split('.');
+    if (length === 5)
+        throw new JWTInvalid('Only JWTs using Compact JWS serialization can be decoded');
+    if (length !== 3)
+        throw new JWTInvalid('Invalid JWT');
+    if (!payload)
+        throw new JWTInvalid('JWTs must contain a payload');
+    let decoded;
+    try {
+        decoded = b64u(payload);
+    }
+    catch {
+        throw new JWTInvalid('Failed to base64url decode the payload');
+    }
+    let result;
+    try {
+        result = JSON.parse(decoder.decode(decoded));
+    }
+    catch {
+        throw new JWTInvalid('Failed to parse the decoded payload as JSON');
+    }
+    if (!isObject(result))
+        throw new JWTInvalid('Invalid JWT Claims Set');
+    return result;
+}