Initial commit: WatchStack v0.1.0

- FastAPI + SQLite backend with REST API
- Polymorphic Media model (book + series)
- Cover lookup via Open Library
- Vanilla HTML/CSS/JS frontend (MAL-inspired)
- Dark theme, status tabs, drawer detail, stats modal
- 8 seed demo entries

app/external.py

@@ -0,0 +1,70 @@
+"""Externe Cover-/Metadaten-Quellen (Open Library)."""
+from __future__ import annotations
+
+import logging
+from typing import Optional
+
+import httpx
+
+log = logging.getLogger(__name__)
+
+OL_SEARCH = "https://openlibrary.org/search.json"
+OL_COVER = "https://covers.openlibrary.org/b/isbn/{isbn}-L.jpg"
+
+
+def lookup_book_by_isbn(isbn: str, *, timeout: float = 8.0) -> Optional[dict]:
+    """Sucht Buchdaten anhand ISBN via Open Library."""
+    if not isbn:
+        return None
+    isbn = isbn.strip().replace("-", "").replace(" ", "")
+    try:
+        with httpx.Client(timeout=timeout) as client:
+            r = client.get(OL_SEARCH, params={"isbn": isbn, "limit": 1})
+            r.raise_for_status()
+            data = r.json()
+    except Exception as exc:  # pragma: no cover
+        log.warning("Open-Library-Suche fehlgeschlagen: %s", exc)
+        return None
+
+    docs = data.get("docs") or []
+    if not docs:
+        return None
+    d = docs[0]
+    return {
+        "title": d.get("title"),
+        "original_title": d.get("title"),
+        "author": ", ".join(d.get("author_name") or []) or None,
+        "release_year": d.get("first_publish_year"),
+        "cover_url": OL_COVER.format(isbn=isbn) if isbn else None,
+        "total_pages": d.get("number_of_pages_median"),
+        "description": None,  # OL liefert hier keine handliche Kurzbeschreibung
+    }
+
+
+def lookup_book_by_title(title: str, *, timeout: float = 8.0) -> Optional[dict]:
+    """Sucht Buchdaten anhand Titel (Fallback)."""
+    if not title:
+        return None
+    try:
+        with httpx.Client(timeout=timeout) as client:
+            r = client.get(OL_SEARCH, params={"title": title, "limit": 1})
+            r.raise_for_status()
+            data = r.json()
+    except Exception as exc:  # pragma: no cover
+        log.warning("Open-Library-Suche fehlgeschlagen: %s", exc)
+        return None
+    docs = data.get("docs") or []
+    if not docs:
+        return None
+    d = docs[0]
+    isbn = None
+    isbns = d.get("isbn") or []
+    if isbns:
+        isbn = isbns[0]
+    return {
+        "title": d.get("title"),
+        "author": ", ".join(d.get("author_name") or []) or None,
+        "release_year": d.get("first_publish_year"),
+        "cover_url": OL_COVER.format(isbn=isbn) if isbn else None,
+        "total_pages": d.get("number_of_pages_median"),
+    }