[interface-change] Phase 4: Extract shared types + fix Docker context

Shared types extracted to shared/types/:
- companion.ts (33+ types, was 100% duplicated admin-lehrer ↔ studio-v2)
- klausur.ts (18+ types, was 95% duplicated across 4 locations)
- ocr-labeling.ts (11 types, was 100% duplicated admin-lehrer ↔ website)

Original type files replaced with re-exports for backward compat.
tsconfig.json paths updated with @shared/* alias in all 3 services.

Docker: Changed build context from ./service to . (root) so shared/
is accessible. Dockerfiles updated to COPY service/ + shared/.

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

admin-lehrer/app/(admin)/ai/ocr-labeling/types.ts

@@ -1,123 +1 @@
-/**
- * TypeScript types for OCR Labeling UI
- */
-
-/**
- * Available OCR Models
- *
- * - llama3.2-vision:11b: Vision LLM, beste Qualitaet bei Handschrift (Standard)
- * - trocr: Microsoft TrOCR, schnell bei gedrucktem Text
- * - paddleocr: PaddleOCR + LLM, 4x schneller durch Hybrid-Ansatz
- * - donut: Document Understanding Transformer, strukturierte Dokumente
- */
-export type OCRModel = 'llama3.2-vision:11b' | 'trocr' | 'paddleocr' | 'donut'
-
-export const OCR_MODEL_INFO: Record<OCRModel, { label: string; description: string; speed: string }> = {
-  'llama3.2-vision:11b': {
-    label: 'Vision LLM',
-    description: 'Beste Qualitaet bei Handschrift',
-    speed: 'langsam',
-  },
-  trocr: {
-    label: 'Microsoft TrOCR',
-    description: 'Schnell bei gedrucktem Text',
-    speed: 'schnell',
-  },
-  paddleocr: {
-    label: 'PaddleOCR + LLM',
-    description: 'Hybrid-Ansatz: OCR + Strukturierung',
-    speed: 'sehr schnell',
-  },
-  donut: {
-    label: 'Donut',
-    description: 'Document Understanding fuer Tabellen/Formulare',
-    speed: 'mittel',
-  },
-}
-
-export interface OCRSession {
-  id: string
-  name: string
-  source_type: 'klausur' | 'handwriting_sample' | 'scan'
-  description?: string
-  ocr_model?: OCRModel
-  total_items: number
-  labeled_items: number
-  confirmed_items: number
-  corrected_items: number
-  skipped_items: number
-  created_at: string
-}
-
-export interface OCRItem {
-  id: string
-  session_id: string
-  session_name: string
-  image_path: string
-  image_url?: string
-  ocr_text?: string
-  ocr_confidence?: number
-  ground_truth?: string
-  status: 'pending' | 'confirmed' | 'corrected' | 'skipped'
-  metadata?: Record<string, unknown>
-  created_at: string
-}
-
-export interface OCRStats {
-  total_sessions?: number
-  session_id?: string
-  name?: string
-  total_items: number
-  labeled_items: number
-  confirmed_items: number
-  corrected_items: number
-  skipped_items?: number
-  pending_items: number
-  exportable_items?: number
-  accuracy_rate: number
-  avg_label_time_seconds?: number
-  progress_percent?: number
-}
-
-export interface TrainingSample {
-  id: string
-  image_path: string
-  ground_truth: string
-  export_format: 'generic' | 'trocr' | 'llama_vision'
-  training_batch: string
-  exported_at?: string
-}
-
-export interface CreateSessionRequest {
-  name: string
-  source_type: 'klausur' | 'handwriting_sample' | 'scan'
-  description?: string
-  ocr_model?: OCRModel
-}
-
-export interface ConfirmRequest {
-  item_id: string
-  label_time_seconds?: number
-}
-
-export interface CorrectRequest {
-  item_id: string
-  ground_truth: string
-  label_time_seconds?: number
-}
-
-export interface ExportRequest {
-  export_format: 'generic' | 'trocr' | 'llama_vision'
-  session_id?: string
-  batch_id?: string
-}
-
-export interface UploadResult {
-  id: string
-  filename: string
-  image_path: string
-  image_hash: string
-  ocr_text?: string
-  ocr_confidence?: number
-  status: string
-}
+export * from '../../../../../shared/types/ocr-labeling'