fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

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

backend/content_service/models.py

@@ -0,0 +1,164 @@
+"""
+BreakPilot Content Service - Database Models
+Educational Content Management mit Creative Commons Lizenzen
+"""
+from sqlalchemy import Column, String, Integer, Float, DateTime, JSON, ForeignKey, Enum, Table
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import relationship
+from datetime import datetime
+import enum
+import uuid
+
+Base = declarative_base()
+
+# Content Type Enum
+class ContentType(str, enum.Enum):
+    VIDEO = "video"
+    PDF = "pdf"
+    IMAGE_GALLERY = "image_gallery"
+    MARKDOWN = "markdown"
+    AUDIO = "audio"
+    H5P = "h5p"
+
+# CC License Enum
+class CCLicense(str, enum.Enum):
+    CC_BY = "CC-BY-4.0"
+    CC_BY_SA = "CC-BY-SA-4.0"
+    CC_BY_NC = "CC-BY-NC-4.0"
+    CC_BY_NC_SA = "CC-BY-NC-SA-4.0"
+    CC0 = "CC0-1.0"
+
+# Category Enum
+class ContentCategory(str, enum.Enum):
+    MOVEMENT = "movement"
+    MATH = "math"
+    STEAM = "steam"
+    LANGUAGE = "language"
+    ARTS = "arts"
+    SOCIAL = "social"
+    MINDFULNESS = "mindfulness"
+
+# Content Status
+class ContentStatus(str, enum.Enum):
+    DRAFT = "draft"
+    REVIEW = "review"
+    PUBLISHED = "published"
+    ARCHIVED = "archived"
+
+# Many-to-Many: Content <-> Tags
+content_tags = Table(
+    'content_tags',
+    Base.metadata,
+    Column('content_id', String, ForeignKey('contents.id')),
+    Column('tag_id', String, ForeignKey('tags.id'))
+)
+
+class Content(Base):
+    """Educational Content Model"""
+    __tablename__ = 'contents'
+
+    # Primary Key
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+
+    # Creator Info
+    creator_id = Column(String, nullable=False, index=True)  # User ID from consent-service
+    creator_name = Column(String, nullable=False)
+    creator_email = Column(String)
+
+    # Content Metadata
+    title = Column(String(500), nullable=False, index=True)
+    description = Column(String(5000))
+    content_type = Column(Enum(ContentType), nullable=False)
+    category = Column(Enum(ContentCategory), nullable=False, index=True)
+
+    # License
+    license = Column(Enum(CCLicense), nullable=False, default=CCLicense.CC_BY_SA)
+
+    # Age Range
+    age_min = Column(Integer, default=6)
+    age_max = Column(Integer, default=18)
+
+    # Files & URLs
+    files = Column(JSON, default=list)  # List of file URLs in MinIO
+    thumbnail_url = Column(String)
+    embed_url = Column(String)  # For YouTube, Vimeo, etc.
+
+    # H5P Specific
+    h5p_content_id = Column(String)  # H5P content ID if type=h5p
+
+    # Matrix Integration
+    matrix_room_id = Column(String)  # Associated Matrix room for discussion
+    matrix_event_id = Column(String)  # Matrix message event ID
+
+    # Status
+    status = Column(Enum(ContentStatus), default=ContentStatus.DRAFT, index=True)
+
+    # Analytics
+    downloads = Column(Integer, default=0)
+    views = Column(Integer, default=0)
+    avg_rating = Column(Float, default=0.0)
+    rating_count = Column(Integer, default=0)
+    impact_score = Column(Float, default=0.0)  # Future: Impact-Scoring
+
+    # Timestamps
+    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    published_at = Column(DateTime)
+
+    # Relationships
+    ratings = relationship("Rating", back_populates="content", cascade="all, delete-orphan")
+    tags = relationship("Tag", secondary=content_tags, back_populates="contents")
+
+    def __repr__(self):
+        return f"<Content {self.title} ({self.content_type})>"
+
+
+class Rating(Base):
+    """Content Ratings by Teachers"""
+    __tablename__ = 'ratings'
+
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+    content_id = Column(String, ForeignKey('contents.id'), nullable=False)
+    user_id = Column(String, nullable=False, index=True)  # Teacher ID
+    user_name = Column(String)
+
+    stars = Column(Integer, nullable=False)  # 1-5
+    comment = Column(String(2000))
+
+    created_at = Column(DateTime, default=datetime.utcnow)
+
+    # Relationship
+    content = relationship("Content", back_populates="ratings")
+
+    def __repr__(self):
+        return f"<Rating {self.stars}★ for Content {self.content_id}>"
+
+
+class Tag(Base):
+    """Content Tags for Search/Filter"""
+    __tablename__ = 'tags'
+
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+    name = Column(String(100), unique=True, nullable=False, index=True)
+    category = Column(String(100))  # Optional grouping
+
+    # Relationship
+    contents = relationship("Content", secondary=content_tags, back_populates="tags")
+
+    def __repr__(self):
+        return f"<Tag {self.name}>"
+
+
+class Download(Base):
+    """Download Tracking (für Impact-Scoring)"""
+    __tablename__ = 'downloads'
+
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+    content_id = Column(String, ForeignKey('contents.id'), nullable=False, index=True)
+    user_id = Column(String, nullable=False, index=True)  # Teacher ID
+
+    downloaded_at = Column(DateTime, default=datetime.utcnow, index=True)
+    ip_address = Column(String)  # Optional, anonymisiert nach 7 Tagen
+
+    def __repr__(self):
+        return f"<Download {self.content_id} by {self.user_id}>"