Merge PR #48: feat: add Xiaohongshu source + Reddit public fallback

- Xiaohongshu search via local MCP service (opt-in, zero impact if service not running)
- Reddit public JSON fallback (works with zero API keys)
- Reddit priority: ScrapeCreators -> OpenAI -> public fallback
- Updated env.py: Reddit always available via public fallback

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

vendor/package/dist/lib/extract-tweet-id.js

@@ -0,0 +1,14 @@
+/**
+ * Extract tweet ID from a Twitter/X URL or return the input unchanged if it's already an ID.
+ */
+const TWEET_URL_REGEX = /(?:twitter\.com|x\.com)\/(?:\w+\/status|i\/web\/status)\/(\d+)/i;
+export function extractTweetId(input) {
+    // If it's a URL, extract the tweet ID
+    const urlMatch = TWEET_URL_REGEX.exec(input);
+    if (urlMatch) {
+        return urlMatch[1];
+    }
+    // Assume it's already an ID
+    return input;
+}
+//# sourceMappingURL=extract-tweet-id.js.map