Fix Connect button scope error and add custom STT cards to conversation dropdown

cardType() was defined inside initLlmsSection() IIFE but called from
renderLocalContainers() which is outside that scope, causing a silent
ReferenceError that reset every Connect click to failure. Moved cardType
to module scope.

Custom STT cards (e.g. whisperx-gpu) are now included in /api/stt-backends
and appear in the Conversation STT dropdown. Added _normalize_service_url()
so 0.0.0.0 URLs in stored cards are rewritten to host.docker.internal for
server-side health checks. _transcribe_audio() tries /transcribe as fallback
for custom backends that don't expose /v1/audio/transcriptions.

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

server.py

@@ -186,8 +186,13 @@ def _safe_child_path(root: Path, candidate: Path) -> Path:
     return candidate_resolved
 
 
+def _normalize_service_url(url: str) -> str:
+    """Replace 0.0.0.0 with host.docker.internal so server-side probes reach the host."""
+    return re.sub(r"(https?://)0\.0\.0\.0([\/:$])", r"\1host.docker.internal\2", str(url or ""))
+
+
 def _validate_http_url(raw: str, *, allow_private: bool = True) -> str:
-    raw = str(raw or "").strip()
+    raw = _normalize_service_url(str(raw or "")).strip()
     if not raw:
         raise HTTPException(400, "URL is required")
     parts = urlsplit(raw)
@@ -1838,13 +1843,22 @@ _STT_BACKEND_METRICS: dict[str, dict] = {
 _STT_VALID_BACKENDS = {"configured", "nvidia_parakeet", "nvidia_router", "faster_whisper", "whisper_cpp", "groq_whisper"}
 
 def _clean_stt_backend(value: str) -> str:
-    key = re.sub(r"[^a-z0-9]+", "_", str(value or "configured").lower()).strip("_")
+    original = str(value or "").strip()
+    if original.startswith("custom:"):
+        return original  # pass through custom card IDs unchanged
+    key = re.sub(r"[^a-z0-9]+", "_", original.lower()).strip("_")
     key = _STT_BACKEND_ALIASES.get(key, key)
     return key if key in _STT_VALID_BACKENDS else "configured"
 
 
 def _stt_backend_url(settings: dict, backend: str) -> str:
     backend = _clean_stt_backend(backend)
+    if backend.startswith("custom:"):
+        custom_id = backend[len("custom:"):]
+        for card in settings.get("custom_engine_cards", []):
+            if str(card.get("id", card.get("name", ""))) == custom_id:
+                return card.get("url", "")
+        return ""
     if backend == "nvidia_parakeet":
         return settings.get("nvidia_asr_url") or _NVIDIA_ASR_DEFAULT
     if backend == "nvidia_router":
@@ -1943,6 +1957,33 @@ async def stt_backends():
             "models": models,
             "metrics": _STT_BACKEND_METRICS.get(backend, {}),
         })
+    # Custom STT cards from settings
+    for card in settings.get("custom_engine_cards", []):
+        if card.get("role") not in ("stt", "stt+tts"):
+            continue
+        raw_url = card.get("url", "").strip()
+        url = _validate_http_url(raw_url, allow_private=True).rstrip("/")
+        if not url:
+            continue
+        card_id = "custom:" + str(card.get("id", card.get("name", "")))
+        if (card_id, url) in seen_urls:
+            continue
+        seen_urls.add((card_id, url))
+        ok, models = _stt_backend_health(url)
+        port = _backend_port_label(url)
+        label = card.get("label") or card.get("name") or "Custom STT"
+        if port:
+            label = f"{port} {label}"
+        items.append({
+            "id": card_id,
+            "label": label,
+            "url": url,
+            "port": port,
+            "available": ok,
+            "model": "whisper-1",
+            "models": models,
+            "metrics": {},
+        })
     return {"backends": items}
 
 
@@ -1966,18 +2007,26 @@ def _transcribe_audio(src: Path, settings: dict, backend: str = "configured") ->
     stt_key = _stt_backend_api_key(settings, backend)
     hdrs = {"Authorization": f"Bearer {stt_key}"} if stt_key else {}
     model = _stt_backend_model(backend)
-    with src.open("rb") as f:
-        resp = requests.post(
-            f"{stt_url}/v1/audio/transcriptions",
-            files={"file": ("audio.wav", f, "audio/wav")},
-            data={"model": model, "response_format": "text"},
-            headers=hdrs,
-            timeout=_STT_REQUEST_TIMEOUT,
-        )
-    if resp.status_code in {400, 404, 422, 500} and model != "whisper-1":
+    # Ordered list of transcription paths to try; custom backends may use /transcribe
+    paths = ["/v1/audio/transcriptions", "/transcribe"] if backend.startswith("custom:") else ["/v1/audio/transcriptions"]
+    resp = None
+    for path in paths:
         with src.open("rb") as f:
             resp = requests.post(
-                f"{stt_url}/v1/audio/transcriptions",
+                f"{stt_url}{path}",
+                files={"file": ("audio.wav", f, "audio/wav")},
+                data={"model": model, "response_format": "text"},
+                headers=hdrs,
+                timeout=_STT_REQUEST_TIMEOUT,
+            )
+        if resp.status_code == 404 and len(paths) > 1:
+            continue  # try next path
+        break
+    if resp.status_code in {400, 404, 422, 500} and model != "whisper-1":
+        path = paths[-1]  # retry on whichever path last responded
+        with src.open("rb") as f:
+            resp = requests.post(
+                f"{stt_url}{path}",
                 files={"file": ("audio.wav", f, "audio/wav")},
                 data={"model": "whisper-1", "response_format": "text"},
                 headers=hdrs,
@@ -3501,6 +3550,11 @@ async def restart_local_container(name: str):
 async def probe_url(url: str, type: str = ""):
     """Server-side API probe — checks service-specific endpoints and validates JSON responses."""
     base = url.rstrip("/")
+    # Strip common API prefixes so callers can paste full base URLs (e.g. .../v1)
+    for _suffix in ("/v1", "/api/v1"):
+        if base.endswith(_suffix):
+            base = base[: -len(_suffix)]
+            break
     hdrs = {"User-Agent": "TTS-Voice-Creator/probe"}
 
     # Ordered list of (path, json_key_that_must_exist_or_None)

static/app.js

@@ -6974,6 +6974,11 @@ function editCustomEngineCard(card) {
 
 // ── Local Docker container management ─────────────────────────────────────
 
+function cardType(card) {
+  const page = card?.closest('[data-page]');
+  return page ? page.dataset.page : '';
+}
+
 async function loadLocalContainers() {
   const gridTts = $('dc-grid-tts');
   const gridStt = $('dc-grid-stt');
@@ -7321,12 +7326,6 @@ document.querySelectorAll('.dc-refresh-btn').forEach(b => b.addEventListener('cl
     return r.json();
   }
 
-  function cardType(card) {
-    const page = card.closest('[data-page]');
-    if (page) return page.dataset.page; // 'llm', 'stt', 'tts'
-    return '';
-  }
-
   function applyCardState(card, key, connected, failed) {
     card.classList.toggle('llm-local-card-online',  connected);
     card.classList.toggle('llm-local-card-offline', !connected && !!failed);