Ship native iOS app, Wiki/TTS backend, and skeleton loading UX.

Replace the WebView shell with SwiftUI screens, add account-scoped Wiki and TTS APIs with adaptive review and photo scan support, and keep web/iOS pages usable while data loads asynchronously.

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

backend/models.py

@@ -1,4 +1,4 @@
-from sqlalchemy import Column, ForeignKey, Integer, String, Text, UniqueConstraint
+from sqlalchemy import Column, Float, ForeignKey, Integer, String, Text, UniqueConstraint
 
 from database import Base
 
@@ -73,7 +73,13 @@ class Word(Base):
     consecutive_correct_count = Column(Integer, nullable=False, default=0)
     mastery_score = Column(Integer, nullable=False, default=0)
     train_count = Column(Integer, nullable=False, default=0)
+    error_bank_member = Column(Integer, nullable=False, default=0)
+    error_reinforce_streak = Column(Integer, nullable=False, default=0)
+    error_bank_entered_at = Column(String(32), nullable=True)
     total_train_seconds = Column(Integer, nullable=False, default=0)
+    difficulty = Column(Float, nullable=False, default=5.0)
+    stability_hours = Column(Float, nullable=False, default=24.0)
+    next_review_at = Column(String(32), nullable=True)
     review_due_date = Column(String(32), nullable=True)
     last_reviewed_at = Column(String(32), nullable=True)
     created_at = Column(String(32), nullable=False)
@@ -101,7 +107,10 @@ class UserSettings(Base):
     daily_target = Column(Integer, nullable=False, default=20)
     master_required_count = Column(Integer, nullable=False, default=3)
     weak_wrong_threshold = Column(Integer, nullable=False, default=3)
+    error_clear_correct_count = Column(Integer, nullable=False, default=2)
     active_book_id = Column(Integer, ForeignKey("word_books.id"), nullable=True)
+    ai_wiki_enabled = Column(Integer, nullable=False, default=0)
+    ai_wiki_auto_organize = Column(Integer, nullable=False, default=0)
 
 
 class UserBookSettings(Base):
@@ -116,6 +125,7 @@ class UserBookSettings(Base):
     daily_target = Column(Integer, nullable=False, default=12)
     master_required_count = Column(Integer, nullable=False, default=3)
     weak_wrong_threshold = Column(Integer, nullable=False, default=2)
+    error_clear_correct_count = Column(Integer, nullable=False, default=2)
 
 
 class DictionaryEntry(Base):
@@ -130,3 +140,84 @@ class DictionaryEntry(Base):
     example_en = Column(Text, nullable=True)
     example_cn = Column(Text, nullable=True)
     source = Column(String(64), nullable=True)
+
+
+class WikiSource(Base):
+    """Immutable learning event ingested into a user's Wiki."""
+
+    __tablename__ = "wiki_sources"
+    __table_args__ = (
+        UniqueConstraint("user_id", "source_key", name="uq_wiki_source_user_key"),
+    )
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    word_id = Column(Integer, ForeignKey("words.id"), nullable=True, index=True)
+    source_key = Column(String(96), nullable=False)
+    source_type = Column(String(32), nullable=False)
+    payload = Column(Text, nullable=False)
+    created_at = Column(String(32), nullable=False)
+
+
+class WikiPage(Base):
+    """Compiled Markdown page owned by one user."""
+
+    __tablename__ = "wiki_pages"
+    __table_args__ = (UniqueConstraint("user_id", "slug", name="uq_wiki_page_user_slug"),)
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    word_id = Column(Integer, ForeignKey("words.id"), nullable=True, index=True)
+    slug = Column(String(160), nullable=False)
+    title = Column(String(500), nullable=False)
+    category = Column(String(32), nullable=False)
+    summary = Column(Text, nullable=False)
+    content = Column(Text, nullable=False)
+    source_count = Column(Integer, nullable=False, default=0)
+    created_at = Column(String(32), nullable=False)
+    updated_at = Column(String(32), nullable=False)
+
+
+class WikiLink(Base):
+    __tablename__ = "wiki_links"
+    __table_args__ = (
+        UniqueConstraint(
+            "user_id",
+            "source_page_id",
+            "target_page_id",
+            "relation",
+            name="uq_wiki_link_edge",
+        ),
+    )
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    source_page_id = Column(Integer, ForeignKey("wiki_pages.id"), nullable=False, index=True)
+    target_page_id = Column(Integer, ForeignKey("wiki_pages.id"), nullable=False, index=True)
+    relation = Column(String(32), nullable=False)
+    created_at = Column(String(32), nullable=False)
+
+
+class WikiLog(Base):
+    __tablename__ = "wiki_logs"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    action = Column(String(32), nullable=False)
+    page_slug = Column(String(160), nullable=True)
+    detail = Column(Text, nullable=False)
+    created_at = Column(String(32), nullable=False)
+
+
+class WikiLlmUsage(Base):
+    """Per-account daily DeepSeek call counter for Wiki compilation."""
+
+    __tablename__ = "wiki_llm_usage"
+    __table_args__ = (
+        UniqueConstraint("user_id", "usage_date", name="uq_wiki_llm_usage_day"),
+    )
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
+    usage_date = Column(String(10), nullable=False)
+    call_count = Column(Integer, nullable=False, default=0)