[split-required] Split 700-870 LOC files across all services

backend-lehrer (11 files):
- llm_gateway/routes/schools.py (867 → 5), recording_api.py (848 → 6)
- messenger_api.py (840 → 5), print_generator.py (824 → 5)
- unit_analytics_api.py (751 → 5), classroom/routes/context.py (726 → 4)
- llm_gateway/routes/edu_search_seeds.py (710 → 4)

klausur-service (12 files):
- ocr_labeling_api.py (845 → 4), metrics_db.py (833 → 4)
- legal_corpus_api.py (790 → 4), page_crop.py (758 → 3)
- mail/ai_service.py (747 → 4), github_crawler.py (767 → 3)
- trocr_service.py (730 → 4), full_compliance_pipeline.py (723 → 4)
- dsfa_rag_api.py (715 → 4), ocr_pipeline_auto.py (705 → 4)

website (6 pages):
- audit-checklist (867 → 8), content (806 → 6)
- screen-flow (790 → 4), scraper (789 → 5)
- zeugnisse (776 → 5), modules (745 → 4)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend-lehrer/messenger_models.py

@@ -0,0 +1,139 @@
+"""
+Messenger API - Pydantic Models.
+
+Data models for contacts, conversations, messages, and groups.
+"""
+
+from typing import List, Optional
+
+from pydantic import BaseModel, Field
+
+
+# ==========================================
+# CONTACT MODELS
+# ==========================================
+
+class ContactBase(BaseModel):
+    """Basis-Modell fuer Kontakte."""
+    name: str = Field(..., min_length=1, max_length=200)
+    email: Optional[str] = None
+    phone: Optional[str] = None
+    role: str = Field(default="parent", description="parent, teacher, staff, student")
+    student_name: Optional[str] = Field(None, description="Name des zugehoerigen Schuelers")
+    class_name: Optional[str] = Field(None, description="Klasse z.B. 10a")
+    notes: Optional[str] = None
+    tags: List[str] = Field(default_factory=list)
+    matrix_id: Optional[str] = Field(None, description="Matrix-ID z.B. @user:matrix.org")
+    preferred_channel: str = Field(default="email", description="email, matrix, pwa")
+
+
+class ContactCreate(ContactBase):
+    """Model fuer neuen Kontakt."""
+    pass
+
+
+class Contact(ContactBase):
+    """Vollstaendiger Kontakt mit ID."""
+    id: str
+    created_at: str
+    updated_at: str
+    online: bool = False
+    last_seen: Optional[str] = None
+
+
+class ContactUpdate(BaseModel):
+    """Update-Model fuer Kontakte."""
+    name: Optional[str] = None
+    email: Optional[str] = None
+    phone: Optional[str] = None
+    role: Optional[str] = None
+    student_name: Optional[str] = None
+    class_name: Optional[str] = None
+    notes: Optional[str] = None
+    tags: Optional[List[str]] = None
+    matrix_id: Optional[str] = None
+    preferred_channel: Optional[str] = None
+
+
+# ==========================================
+# GROUP MODELS
+# ==========================================
+
+class GroupBase(BaseModel):
+    """Basis-Modell fuer Gruppen."""
+    name: str = Field(..., min_length=1, max_length=100)
+    description: Optional[str] = None
+    group_type: str = Field(default="class", description="class, department, custom")
+
+
+class GroupCreate(GroupBase):
+    """Model fuer neue Gruppe."""
+    member_ids: List[str] = Field(default_factory=list)
+
+
+class Group(GroupBase):
+    """Vollstaendige Gruppe mit ID."""
+    id: str
+    member_ids: List[str] = []
+    created_at: str
+    updated_at: str
+
+
+# ==========================================
+# MESSAGE MODELS
+# ==========================================
+
+class MessageBase(BaseModel):
+    """Basis-Modell fuer Nachrichten."""
+    content: str = Field(..., min_length=1)
+    content_type: str = Field(default="text", description="text, file, image")
+    file_url: Optional[str] = None
+    send_email: bool = Field(default=False, description="Nachricht auch per Email senden")
+
+
+class MessageCreate(MessageBase):
+    """Model fuer neue Nachricht."""
+    conversation_id: str
+
+
+class Message(MessageBase):
+    """Vollstaendige Nachricht mit ID."""
+    id: str
+    conversation_id: str
+    sender_id: str  # "self" fuer eigene Nachrichten
+    timestamp: str
+    read: bool = False
+    read_at: Optional[str] = None
+    email_sent: bool = False
+    email_sent_at: Optional[str] = None
+    email_error: Optional[str] = None
+
+
+# ==========================================
+# CONVERSATION MODELS
+# ==========================================
+
+class ConversationBase(BaseModel):
+    """Basis-Modell fuer Konversationen."""
+    name: Optional[str] = None
+    is_group: bool = False
+
+
+class Conversation(ConversationBase):
+    """Vollstaendige Konversation mit ID."""
+    id: str
+    participant_ids: List[str] = []
+    group_id: Optional[str] = None
+    created_at: str
+    updated_at: str
+    last_message: Optional[str] = None
+    last_message_time: Optional[str] = None
+    unread_count: int = 0
+
+
+class CSVImportResult(BaseModel):
+    """Ergebnis eines CSV-Imports."""
+    imported: int
+    skipped: int
+    errors: List[str]
+    contacts: List[Contact]