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

frontend/components/AdminButton.tsx

@@ -0,0 +1,175 @@
+'use client';
+
+import { useState } from 'react';
+
+interface AdminButtonProps {
+  articleId: number;
+  articleTitle: string;
+}
+
+export default function AdminButton({ articleId, articleTitle }: AdminButtonProps) {
+  const [showPanel, setShowPanel] = useState(false);
+  const [isAdmin, setIsAdmin] = useState(false);
+  const [password, setPassword] = useState('');
+  const [loading, setLoading] = useState(false);
+  const [message, setMessage] = useState('');
+
+  // Check if admin mode is enabled (password in sessionStorage)
+  const checkAdmin = () => {
+    if (typeof window !== 'undefined') {
+      const stored = sessionStorage.getItem('adminAuth');
+      if (stored) {
+        setIsAdmin(true);
+        return true;
+      }
+    }
+    return false;
+  };
+
+  const handleAuth = () => {
+    if (password) {
+      sessionStorage.setItem('adminAuth', password);
+      setIsAdmin(true);
+      setMessage('');
+    }
+  };
+
+  const handleAction = async (action: string) => {
+    if (!checkAdmin() && !password) {
+      setMessage('Please enter admin password');
+      return;
+    }
+
+    setLoading(true);
+    setMessage('');
+
+    const authToken = sessionStorage.getItem('adminAuth') || password;
+
+    try {
+      const response = await fetch('/api/admin/article', {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          'Authorization': `Bearer ${authToken}`
+        },
+        body: JSON.stringify({
+          articleId,
+          action,
+          reason: action === 'unpublish' ? 'Flagged by admin' : undefined
+        })
+      });
+
+      const data = await response.json();
+
+      if (response.ok) {
+        setMessage(`✅ ${data.message}`);
+        
+        // Reload page after 1 second
+        setTimeout(() => {
+          window.location.reload();
+        }, 1000);
+      } else {
+        setMessage(`❌ ${data.error}`);
+        if (response.status === 401) {
+          sessionStorage.removeItem('adminAuth');
+          setIsAdmin(false);
+        }
+      }
+    } catch (error) {
+      setMessage('❌ Error: ' + error);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  // Show admin button only when Alt+Shift+A is pressed
+  if (typeof window !== 'undefined') {
+    if (!showPanel) {
+      window.addEventListener('keydown', (e) => {
+        if (e.altKey && e.shiftKey && e.key === 'A') {
+          setShowPanel(true);
+          checkAdmin();
+        }
+      });
+    }
+  }
+
+  if (!showPanel) return null;
+
+  return (
+    <div className="fixed bottom-4 right-4 bg-red-600 text-white p-4 rounded-lg shadow-lg max-w-sm z-50">
+      <div className="flex justify-between items-start mb-3">
+        <h3 className="font-bold text-sm">Admin Controls</h3>
+        <button 
+          onClick={() => setShowPanel(false)}
+          className="text-white hover:text-gray-200"
+        >
+          ✕
+        </button>
+      </div>
+
+      <div className="text-xs mb-3">
+        <strong>Article #{articleId}</strong><br/>
+        {articleTitle.substring(0, 50)}...
+      </div>
+
+      {!isAdmin ? (
+        <div className="mb-3">
+          <input
+            type="password"
+            placeholder="Admin password"
+            value={password}
+            onChange={(e) => setPassword(e.target.value)}
+            onKeyDown={(e) => e.key === 'Enter' && handleAuth()}
+            className="w-full px-3 py-2 text-sm text-black rounded border"
+          />
+          <button
+            onClick={handleAuth}
+            className="w-full mt-2 px-3 py-2 bg-white text-red-600 rounded text-sm font-bold hover:bg-gray-100"
+          >
+            Unlock Admin
+          </button>
+        </div>
+      ) : (
+        <div className="space-y-2">
+          <button
+            onClick={() => handleAction('unpublish')}
+            disabled={loading}
+            className="w-full px-3 py-2 bg-yellow-500 text-black rounded text-sm font-bold hover:bg-yellow-400 disabled:opacity-50"
+          >
+            {loading ? 'Processing...' : '🚫 Unpublish (Hide)'}
+          </button>
+          
+          <button
+            onClick={() => handleAction('delete')}
+            disabled={loading}
+            className="w-full px-3 py-2 bg-red-800 text-white rounded text-sm font-bold hover:bg-red-700 disabled:opacity-50"
+          >
+            {loading ? 'Processing...' : '🗑️ Delete Forever'}
+          </button>
+
+          <button
+            onClick={() => {
+              sessionStorage.removeItem('adminAuth');
+              setIsAdmin(false);
+              setPassword('');
+            }}
+            className="w-full px-3 py-2 bg-gray-700 text-white rounded text-sm hover:bg-gray-600"
+          >
+            Lock Admin
+          </button>
+        </div>
+      )}
+
+      {message && (
+        <div className="mt-3 text-xs p-2 bg-white text-black rounded">
+          {message}
+        </div>
+      )}
+
+      <div className="mt-3 text-xs text-gray-300">
+        Press Alt+Shift+A to toggle
+      </div>
+    </div>
+  );
+}