feat: terminology fix (Entry→Event), diary page generation, settings refactor

- Rename Entry→Event throughout frontend and backend
- Change 'journal' terminology to 'diary page'
- Add professional footer with links
- Redirect to diary page after generation
- Error handling for generation failures
- Fix settings to store per-provider configs in providerSettings
- Backend reads API key from providerSettings
- Use prisma db push instead of migrate for schema sync
- Clean up duplicate entries.ts file

frontend/src/pages/Journal.tsx

@@ -197,7 +197,7 @@ export default function JournalPage() {
       <div className="max-w-4xl mx-auto p-4">
         <div className="mb-6">
           <a href={`/day/${date}`} className="text-slate-400 hover:text-white text-sm mb-1 inline-block">← Back to day</a>
-          <h1 className="text-2xl font-bold">Journal</h1>
+          <h1 className="text-2xl font-bold">Diary Page</h1>
           <p className="text-slate-400">{formatDate(date)}</p>
         </div>
 
@@ -205,19 +205,19 @@ export default function JournalPage() {
           <div className="text-center py-12 text-slate-400">Loading...</div>
         ) : !journal || journal.content === 'Generating...' ? (
           <div className="text-center py-12">
-            <p className="text-slate-400 mb-4">No journal generated yet</p>
+            <p className="text-slate-400 mb-4">No diary page written yet</p>
             <button
               onClick={handleGenerate}
               disabled={generating}
               className="px-6 py-3 bg-purple-600 hover:bg-purple-700 rounded-lg font-medium transition disabled:opacity-50"
             >
-              Generate Journal
+              Generate Diary Page
             </button>
           </div>
         ) : (
           <div>
             <div className="text-sm text-slate-400 mb-4">
-              Generated {new Date(journal.generatedAt).toLocaleString()} • {journal.entryCount} entries
+              Generated {new Date(journal.generatedAt).toLocaleString()} • {journal.eventCount} events
             </div>
             <div className="prose prose-invert prose-slate max-w-none">
               <div className="bg-slate-900 rounded-xl p-6 border border-slate-800 whitespace-pre-wrap leading-relaxed">
@@ -230,7 +230,7 @@ export default function JournalPage() {
                 disabled={generating}
                 className="px-4 py-2 bg-slate-800 hover:bg-slate-700 rounded-lg text-sm transition disabled:opacity-50"
               >
-                Regenerate
+                Rewrite
               </button>
               <a 
                 href={`/tasks/${date}`}