Add web admin features + fix scraper & translator

Frontend changes:
- Add /admin dashboard for article management
- Add AdminButton component (Alt+Shift+A on articles)
- Add /api/admin/article API endpoints

Backend improvements:
- scraper_v2.py: Multi-layer fallback extraction (newspaper → trafilatura → readability)
- translator_v2.py: Better chunking, repetition detection, validation
- admin_tools.py: CLI admin commands
- test_scraper.py: Individual source testing

Docs:
- WEB-ADMIN-GUIDE.md: Web admin usage
- ADMIN-GUIDE.md: CLI admin usage
- SCRAPER-IMPROVEMENT-PLAN.md: Scraper fixes details
- TRANSLATION-FIX.md: Translation improvements
- ADMIN-FEATURES-SUMMARY.md: Implementation summary

Fixes:
- Article scraping from 0 → 96+ articles working
- Translation quality issues (repetition, truncation)
- Added 13 new RSS sources

backend/fix_article_50.py

@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+"""
+Re-translate article ID 50 which has broken/truncated translation
+"""
+
+import sys
+from loguru import logger
+from translator_v2 import BurmeseTranslator
+import database
+
+def fix_article(article_id: int):
+    """Re-translate a specific article"""
+    
+    logger.info(f"Fixing article {article_id}...")
+    
+    # Get article from database
+    import psycopg2
+    from dotenv import load_dotenv
+    import os
+    
+    load_dotenv()
+    conn = psycopg2.connect(os.getenv('DATABASE_URL'))
+    cur = conn.cursor()
+    
+    cur.execute('''
+        SELECT id, title, excerpt, content
+        FROM articles
+        WHERE id = %s
+    ''', (article_id,))
+    
+    row = cur.fetchone()
+    if not row:
+        logger.error(f"Article {article_id} not found")
+        return False
+    
+    article = {
+        'id': row[0],
+        'title': row[1],
+        'excerpt': row[2],
+        'content': row[3]
+    }
+    
+    logger.info(f"Article: {article['title'][:50]}...")
+    logger.info(f"Content length: {len(article['content'])} chars")
+    
+    # Translate
+    translator = BurmeseTranslator()
+    translated = translator.translate_article(article)
+    
+    logger.info(f"Translation complete:")
+    logger.info(f"  Title Burmese: {len(translated['title_burmese'])} chars")
+    logger.info(f"  Excerpt Burmese: {len(translated['excerpt_burmese'])} chars")
+    logger.info(f"  Content Burmese: {len(translated['content_burmese'])} chars")
+    
+    # Validate
+    ratio = len(translated['content_burmese']) / len(article['content'])
+    logger.info(f"  Length ratio: {ratio:.2f} (should be 0.5-2.0)")
+    
+    if ratio < 0.3:
+        logger.error("Translation still too short! Not updating.")
+        return False
+    
+    # Update database
+    cur.execute('''
+        UPDATE articles
+        SET title_burmese = %s,
+            excerpt_burmese = %s,
+            content_burmese = %s
+        WHERE id = %s
+    ''', (
+        translated['title_burmese'],
+        translated['excerpt_burmese'],
+        translated['content_burmese'],
+        article_id
+    ))
+    
+    conn.commit()
+    logger.info(f"✅ Article {article_id} updated successfully")
+    
+    cur.close()
+    conn.close()
+    
+    return True
+
+if __name__ == '__main__':
+    import config
+    logger.add(sys.stdout, level="INFO")
+    
+    article_id = int(sys.argv[1]) if len(sys.argv) > 1 else 50
+    fix_article(article_id)