Fix: Remove broken getKlausurApiUrl and clean up empty lines

sed replacement left orphaned hostname references in story page
and empty lines in getApiBase functions.

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

klausur-service/backend/vocab_worksheet_models.py

@@ -0,0 +1,86 @@
+"""Pydantic models and enums for the Vocab Worksheet API."""
+
+from datetime import datetime
+from enum import Enum
+from typing import List, Optional
+
+from pydantic import BaseModel
+
+
+# =============================================================================
+# Enums
+# =============================================================================
+
+class WorksheetType(str, Enum):
+    EN_TO_DE = "en_to_de"          # English -> German translation
+    DE_TO_EN = "de_to_en"          # German -> English translation
+    COPY_PRACTICE = "copy"         # Write word multiple times
+    GAP_FILL = "gap_fill"          # Fill in the blanks
+    COMBINED = "combined"          # All types combined
+
+
+class SessionStatus(str, Enum):
+    PENDING = "pending"            # Session created, no upload yet
+    PROCESSING = "processing"      # OCR in progress
+    EXTRACTED = "extracted"        # Vocabulary extracted, ready to edit
+    COMPLETED = "completed"        # Worksheet generated
+
+
+# =============================================================================
+# Pydantic Models
+# =============================================================================
+
+class VocabularyEntry(BaseModel):
+    id: str
+    english: str
+    german: str
+    example_sentence: Optional[str] = None
+    example_sentence_gap: Optional[str] = None  # With ___ for gap-fill
+    word_type: Optional[str] = None  # noun, verb, adjective, etc.
+    source_page: Optional[int] = None  # Page number where entry was found (1-indexed)
+
+
+class SessionCreate(BaseModel):
+    name: str
+    description: Optional[str] = None
+    source_language: str = "en"  # Source language (default English)
+    target_language: str = "de"  # Target language (default German)
+
+
+class SessionResponse(BaseModel):
+    id: str
+    name: str
+    description: Optional[str]
+    source_language: str
+    target_language: str
+    status: str
+    vocabulary_count: int
+    image_path: Optional[str]
+    created_at: datetime
+
+
+class VocabularyResponse(BaseModel):
+    session_id: str
+    vocabulary: List[VocabularyEntry]
+    extraction_confidence: Optional[float]
+
+
+class VocabularyUpdate(BaseModel):
+    vocabulary: List[VocabularyEntry]
+
+
+class WorksheetGenerateRequest(BaseModel):
+    worksheet_types: List[WorksheetType]
+    title: Optional[str] = None
+    include_solutions: bool = True
+    repetitions: int = 3  # For copy practice
+    line_height: str = "normal"  # normal, large, extra-large
+
+
+class WorksheetResponse(BaseModel):
+    id: str
+    session_id: str
+    worksheet_types: List[str]
+    pdf_path: str
+    solution_path: Optional[str]
+    generated_at: datetime