Add word-book practice, iOS app shell, and fix embedded WebView blank screen.

Ship dual-track learning (daily accumulation vs textbook),沪教/商务词书 APIs and UI, native iOS wrapper with bundled H5, and production book import on deploy.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/services/word_service.py

@@ -6,6 +6,8 @@ from sqlalchemy.orm import Session
 
 from models import QuizRecord, Word, User
 
+ACCUMULATION_BOOK_ID = 0
+
 
 def utc_now_iso() -> str:
     return datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
@@ -20,10 +22,12 @@ def calc_mastery_score(correct: int, wrong: int) -> int:
 
 class WordService:
     def create_word(self, db: Session, user: User, data: dict) -> Word:
+        book_id = data.get("book_id") or ACCUMULATION_BOOK_ID
         existing = (
             db.query(Word)
             .filter(
                 Word.user_id == user.id,
+                Word.book_id == book_id,
                 Word.source_text == data["source_text"],
                 Word.target_text == data["target_text"],
             )
@@ -34,6 +38,8 @@ class WordService:
 
         word = Word(
             user_id=user.id,
+            book_id=book_id,
+            book_entry_id=data.get("book_entry_id"),
             source_text=data["source_text"],
             target_text=data["target_text"],
             source_lang=data["source_lang"],
@@ -54,8 +60,18 @@ class WordService:
         db.refresh(word)
         return word
 
-    def list_words(self, db: Session, user: User, status: Optional[str] = None) -> list[Word]:
+    def list_words(
+        self,
+        db: Session,
+        user: User,
+        status: Optional[str] = None,
+        book_id: Optional[int] = None,
+    ) -> list[Word]:
         q = db.query(Word).filter(Word.user_id == user.id)
+        if book_id is None:
+            q = q.filter(Word.book_id == ACCUMULATION_BOOK_ID)
+        elif book_id > 0:
+            q = q.filter(Word.book_id == book_id)
         if status:
             q = q.filter(Word.status == status)
         return q.order_by(Word.created_at.desc()).all()