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/schemas.py

@@ -0,0 +1,191 @@
+"""
+Pydantic Schemas für Content Service API
+"""
+from pydantic import BaseModel, Field, validator
+from typing import Optional, List
+from datetime import datetime
+from models import ContentType, CCLicense, ContentCategory, ContentStatus
+
+# ============= REQUEST SCHEMAS =============
+
+class ContentCreate(BaseModel):
+    """Schema für Content Creation"""
+    title: str = Field(..., min_length=3, max_length=500)
+    description: Optional[str] = Field(None, max_length=5000)
+    content_type: ContentType
+    category: ContentCategory
+    license: CCLicense = CCLicense.CC_BY_SA
+
+    age_min: int = Field(6, ge=3, le=18)
+    age_max: int = Field(18, ge=3, le=18)
+
+    embed_url: Optional[str] = None
+    tags: List[str] = []
+
+    @validator('age_max')
+    def age_max_must_be_greater(cls, v, values):
+        if 'age_min' in values and v < values['age_min']:
+            raise ValueError('age_max must be >= age_min')
+        return v
+
+class ContentUpdate(BaseModel):
+    """Schema für Content Update"""
+    title: Optional[str] = Field(None, min_length=3, max_length=500)
+    description: Optional[str] = Field(None, max_length=5000)
+    category: Optional[ContentCategory] = None
+    license: Optional[CCLicense] = None
+    age_min: Optional[int] = Field(None, ge=3, le=18)
+    age_max: Optional[int] = Field(None, ge=3, le=18)
+    embed_url: Optional[str] = None
+    tags: Optional[List[str]] = None
+    status: Optional[ContentStatus] = None
+
+class RatingCreate(BaseModel):
+    """Schema für Rating Creation"""
+    stars: int = Field(..., ge=1, le=5)
+    comment: Optional[str] = Field(None, max_length=2000)
+
+# ============= RESPONSE SCHEMAS =============
+
+class TagResponse(BaseModel):
+    """Tag Response"""
+    id: str
+    name: str
+    category: Optional[str]
+
+    class Config:
+        from_attributes = True
+
+class RatingResponse(BaseModel):
+    """Rating Response"""
+    id: str
+    user_id: str
+    user_name: Optional[str]
+    stars: int
+    comment: Optional[str]
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+class ContentResponse(BaseModel):
+    """Content Response (Full)"""
+    id: str
+    creator_id: str
+    creator_name: str
+    creator_email: Optional[str]
+
+    title: str
+    description: Optional[str]
+    content_type: ContentType
+    category: ContentCategory
+    license: CCLicense
+
+    age_min: int
+    age_max: int
+
+    files: List[str]
+    thumbnail_url: Optional[str]
+    embed_url: Optional[str]
+    h5p_content_id: Optional[str]
+
+    matrix_room_id: Optional[str]
+    matrix_event_id: Optional[str]
+
+    status: ContentStatus
+
+    downloads: int
+    views: int
+    avg_rating: float
+    rating_count: int
+    impact_score: float
+
+    created_at: datetime
+    updated_at: datetime
+    published_at: Optional[datetime]
+
+    tags: List[TagResponse] = []
+
+    class Config:
+        from_attributes = True
+
+class ContentListItem(BaseModel):
+    """Content Response (List View - simplified)"""
+    id: str
+    creator_name: str
+    title: str
+    description: Optional[str]
+    content_type: ContentType
+    category: ContentCategory
+    license: CCLicense
+    thumbnail_url: Optional[str]
+    avg_rating: float
+    rating_count: int
+    downloads: int
+    created_at: datetime
+    tags: List[str] = []
+
+    class Config:
+        from_attributes = True
+
+class ContentWithRatings(ContentResponse):
+    """Content with ratings included"""
+    ratings: List[RatingResponse] = []
+
+    class Config:
+        from_attributes = True
+
+# ============= FILTER SCHEMAS =============
+
+class ContentFilter(BaseModel):
+    """Search/Filter Parameters"""
+    search: Optional[str] = None
+    category: Optional[ContentCategory] = None
+    content_type: Optional[ContentType] = None
+    license: Optional[CCLicense] = None
+    age_min: Optional[int] = None
+    age_max: Optional[int] = None
+    tags: Optional[List[str]] = None
+    min_rating: Optional[float] = None
+    status: Optional[ContentStatus] = ContentStatus.PUBLISHED
+    creator_id: Optional[str] = None
+
+    # Pagination
+    skip: int = Field(0, ge=0)
+    limit: int = Field(20, ge=1, le=100)
+
+    # Sorting
+    sort_by: str = Field("created_at", pattern="^(created_at|avg_rating|downloads|title)$")
+    sort_desc: bool = True
+
+# ============= ANALYTICS SCHEMAS =============
+
+class ContentStats(BaseModel):
+    """Content Statistics"""
+    total_contents: int
+    total_downloads: int
+    total_views: int
+    avg_rating: float
+    by_category: dict
+    by_type: dict
+    by_license: dict
+
+class CreatorStats(BaseModel):
+    """Creator Statistics"""
+    creator_id: str
+    creator_name: str
+    total_contents: int
+    total_downloads: int
+    total_views: int
+    avg_rating: float
+    impact_score: float
+    content_breakdown: dict
+
+# ============= UPLOAD SCHEMAS =============
+
+class FileUploadResponse(BaseModel):
+    """File Upload Response"""
+    file_url: str
+    file_name: str
+    file_size: int
+    content_type: str