feat(diarization-ui): multi-file audio upload with project create-or-select

- Upload page accepts multiple audio files at once
- Project field is a combobox: pick existing or type new name (auto-created)
- Document titles derived from filename without extension
- Files uploaded sequentially with progress bar
- New POST /projects/create-api endpoint (idempotent: returns existing if name matches)
- POST /upload now returns JSON {job_id} instead of HTML redirect

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

app.py

@@ -470,32 +470,102 @@ def healthz():
 @app.get("/", response_class=HTMLResponse)
 def upload_page(msg: str = ""):
     projects = get_projects()
-    opts = "".join([f"<option value='{p['id']}'>{p['name']}</option>" for p in projects])
+    existing_names = json.dumps([p["name"] for p in projects], ensure_ascii=False)
+    existing_map = json.dumps({p["name"]: p["id"] for p in projects}, ensure_ascii=False)
     body = f"""
 <div class='d-flex justify-content-between align-items-center mb-3'>
   <h2 class='h4 mb-0'>Audio Upload</h2>
 </div>
-<p class='text-secondary'>Audio wird transkribiert + mit Sprechern angereichert und als Dokument gespeichert.</p>
+<p class='text-secondary'>Mehrere Audiodateien gleichzeitig hochladen — je Datei wird ein Transkriptions-Job erstellt.</p>
 {f"<div class='alert alert-info py-2'>{msg}</div>" if msg else ""}
-<form action='/upload' method='post' enctype='multipart/form-data' class='card'>
+<div class='card'>
-  <div class='row g-2'>
+  <div class='row g-3 mb-3'>
-    <div class='col-12 col-lg-4'>
+    <div class='col-12 col-md-5'>
-      <label class='form-label'>Projekt</label>
+      <label class='form-label'>Projekt <span class='text-secondary fw-normal'>(bestehendes wählen oder neuen Namen eingeben)</span></label>
-      <select class='form-select' name='project_id'>{opts}</select>
+      <input class='form-control' id='projectInput' list='projectList' placeholder='Projekt wählen oder anlegen …' autocomplete='off'>
+      <datalist id='projectList'></datalist>
     </div>
-    <div class='col-12 col-lg-4'>
+    <div class='col-12 col-md-7'>
-      <label class='form-label'>Titel (optional)</label>
+      <label class='form-label'>Audio-Dateien</label>
-      <input class='form-control' name='title' placeholder='z. B. Team-Call 23.03'>
+      <input class='form-control' type='file' id='fileInput' accept='audio/*' multiple required>
-    </div>
-    <div class='col-12 col-lg-4'>
-      <label class='form-label'>Audio-Datei</label>
-      <input class='form-control' type='file' name='file' accept='audio/*' required>
     </div>
   </div>
-  <div class='mt-3'>
+  <div id='filePreview' class='mb-3 d-none'>
-    <button class='btn btn-primary' type='submit'>Verarbeiten & speichern</button>
+    <div class='text-secondary small mb-1'>Warteschlange:</div>
+    <ul id='fileList' class='list-group list-group-flush'></ul>
   </div>
-</form>
+  <button class='btn btn-primary' id='uploadBtn' onclick='startUpload()' disabled>
+    <i class='bi bi-cloud-upload'></i> <span id='uploadBtnLabel'>Hochladen & verarbeiten</span>
+  </button>
+</div>
+<div id='uploadProgress' class='d-none'>
+  <div class='progress mb-2' style='height:8px'>
+    <div class='progress-bar progress-bar-striped progress-bar-animated' id='progressBar' style='width:0%'></div>
+  </div>
+  <div id='progressStatus' class='text-secondary small'></div>
+</div>
+<script>
+const _existingNames = {existing_names};
+const _existingMap = {existing_map};
+const datalist = document.getElementById('projectList');
+_existingNames.forEach(n => {{ const o = document.createElement('option'); o.value = n; datalist.appendChild(o); }});
+
+const fileInput = document.getElementById('fileInput');
+const projectInput = document.getElementById('projectInput');
+const uploadBtn = document.getElementById('uploadBtn');
+
+function updateBtn() {{
+  uploadBtn.disabled = !(fileInput.files.length > 0 && projectInput.value.trim());
+}}
+fileInput.addEventListener('change', () => {{
+  updateBtn();
+  const list = document.getElementById('fileList');
+  list.innerHTML = '';
+  Array.from(fileInput.files).forEach(f => {{
+    const stem = f.name.replace(/\\.[^/.]+$/, '');
+    const li = document.createElement('li');
+    li.className = 'list-group-item py-1 small d-flex justify-content-between';
+    li.innerHTML = `<span><i class='bi bi-file-earmark-music'></i> ${{stem}}</span><span class='text-secondary'>${{(f.size/1024/1024).toFixed(1)}} MB</span>`;
+    list.appendChild(li);
+  }});
+  document.getElementById('filePreview').classList.toggle('d-none', fileInput.files.length === 0);
+}});
+projectInput.addEventListener('input', updateBtn);
+
+async function startUpload() {{
+  const name = projectInput.value.trim();
+  if(!name || fileInput.files.length === 0) return;
+  uploadBtn.disabled = true;
+  document.getElementById('uploadProgress').classList.remove('d-none');
+  const files = Array.from(fileInput.files);
+  const bar = document.getElementById('progressBar');
+  const status = document.getElementById('progressStatus');
+
+  // resolve or create project
+  let projectId = _existingMap[name];
+  if(!projectId) {{
+    status.textContent = `Projekt "${{name}}" wird angelegt …`;
+    const r = await fetch('/projects/create-api', {{method:'POST', headers:{{'Content-Type':'application/x-www-form-urlencoded'}}, body: new URLSearchParams({{name}})}});
+    if(!r.ok) {{ alert('Fehler beim Anlegen des Projekts'); uploadBtn.disabled=false; return; }}
+    projectId = (await r.json()).id;
+  }}
+
+  for(let i=0; i<files.length; i++) {{
+    const f = files[i];
+    const stem = f.name.replace(/\\.[^/.]+$/, '');
+    status.textContent = `(${{i+1}}/${{files.length}}) ${{stem}} …`;
+    bar.style.width = (i / files.length * 100) + '%';
+    const fd = new FormData();
+    fd.append('project_id', projectId);
+    fd.append('file', f);
+    const r = await fetch('/upload', {{method:'POST', body: fd}});
+    if(!r.ok) {{ status.textContent = `Fehler bei ${{stem}}`; }}
+  }}
+  bar.style.width = '100%';
+  status.textContent = `${{files.length}} Datei(en) eingereicht — weiter zur Job-Übersicht …`;
+  setTimeout(() => location.href='/jobs', 800);
+}}
+</script>
 """
     return layout("Upload", body)
 
@@ -530,24 +600,38 @@ def delete_project(project_id: int):
     return HTMLResponse("<meta http-equiv='refresh' content='0; url=/prompts'>")
 
 
-@app.post("/upload", response_class=HTMLResponse)
+@app.post("/projects/create-api")
-async def upload(project_id: int = Form(...), title: str = Form(""), file: UploadFile = File(...)):
+def create_project_api(name: str = Form(...)):
+    name = name.strip()
+    if not name:
+        raise HTTPException(400, "Name darf nicht leer sein")
+    with db() as c:
+        existing = c.execute("SELECT id FROM projects WHERE name=?", (name,)).fetchone()
+        if existing:
+            return {"id": existing["id"]}
+        cur = c.execute("INSERT INTO projects(name, created_at) VALUES (?,?)", (name, now_iso()))
+        return {"id": cur.lastrowid}
+
+
+@app.post("/upload")
+async def upload(project_id: int = Form(...), file: UploadFile = File(...)):
     data = await file.read()
     if not data:
         raise HTTPException(400, "Leere Datei")
 
     JOB_DIR.mkdir(parents=True, exist_ok=True)
     filename = (file.filename or "audio.bin").replace("/", "_")
+    stem = filename.rsplit(".", 1)[0] or filename
     temp_path = JOB_DIR / f"{now_iso().replace(':','-')}_{filename}"
     temp_path.write_bytes(data)
 
     job_id = enqueue_job(
         "upload",
         project_id=project_id,
-        title=(title or "").strip() or filename,
+        title=stem,
         file_path=str(temp_path),
     )
-    return HTMLResponse(f"<meta http-equiv='refresh' content='0; url=/jobs?queued={job_id}'>")
+    return {"job_id": job_id}
 
 
 @app.get("/library", response_class=HTMLResponse)