Restructure: Move final 16 root files into packages (backend-lehrer)

classroom/ (+2): state_engine_api, state_engine_models
vocabulary/ (2): api, db
worksheets/ (2): api, models
services/  (+6): audio, email, translation, claude_vision, ai_processor, story_generator
api/        (4): school, klausur_proxy, progress, user_language

Only main.py + config.py remain at root. 16 shims added.

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

backend-lehrer/progress_api.py

@@ -1,131 +1,4 @@
-"""
-Progress API — Tracks student learning progress per unit.
-
-Stores coins, crowns, streak data, and exercise completion stats.
-Uses JSON file storage (same pattern as learning_units.py).
-"""
-
-import os
-import json
-import logging
-from datetime import datetime, date
-from typing import Dict, Any, Optional, List
-from pathlib import Path
-
-from fastapi import APIRouter, HTTPException
-from pydantic import BaseModel
-
-logger = logging.getLogger(__name__)
-
-router = APIRouter(
-    prefix="/progress",
-    tags=["progress"],
-)
-
-PROGRESS_DIR = os.path.expanduser("~/Arbeitsblaetter/Lerneinheiten/progress")
-
-
-def _ensure_dir():
-    os.makedirs(PROGRESS_DIR, exist_ok=True)
-
-
-def _progress_path(unit_id: str) -> Path:
-    return Path(PROGRESS_DIR) / f"{unit_id}.json"
-
-
-def _load_progress(unit_id: str) -> Dict[str, Any]:
-    path = _progress_path(unit_id)
-    if path.exists():
-        with open(path, "r", encoding="utf-8") as f:
-            return json.load(f)
-    return {
-        "unit_id": unit_id,
-        "coins": 0,
-        "crowns": 0,
-        "streak_days": 0,
-        "last_activity": None,
-        "exercises": {
-            "flashcards": {"completed": 0, "correct": 0, "incorrect": 0},
-            "quiz": {"completed": 0, "correct": 0, "incorrect": 0},
-            "type": {"completed": 0, "correct": 0, "incorrect": 0},
-            "story": {"generated": 0},
-        },
-        "created_at": datetime.now().isoformat(),
-    }
-
-
-def _save_progress(unit_id: str, data: Dict[str, Any]):
-    _ensure_dir()
-    path = _progress_path(unit_id)
-    with open(path, "w", encoding="utf-8") as f:
-        json.dump(data, f, ensure_ascii=False, indent=2)
-
-
-class RewardPayload(BaseModel):
-    exercise_type: str  # flashcards, quiz, type, story
-    correct: bool = True
-    first_try: bool = True
-
-
-@router.get("/{unit_id}")
-def get_progress(unit_id: str):
-    """Get learning progress for a unit."""
-    return _load_progress(unit_id)
-
-
-@router.post("/{unit_id}/reward")
-def add_reward(unit_id: str, payload: RewardPayload):
-    """Record an exercise result and award coins."""
-    progress = _load_progress(unit_id)
-
-    # Update exercise stats
-    ex = progress["exercises"].get(payload.exercise_type, {"completed": 0, "correct": 0, "incorrect": 0})
-    ex["completed"] = ex.get("completed", 0) + 1
-    if payload.correct:
-        ex["correct"] = ex.get("correct", 0) + 1
-    else:
-        ex["incorrect"] = ex.get("incorrect", 0) + 1
-    progress["exercises"][payload.exercise_type] = ex
-
-    # Award coins
-    if payload.correct:
-        coins = 3 if payload.first_try else 1
-    else:
-        coins = 0
-    progress["coins"] = progress.get("coins", 0) + coins
-
-    # Update streak
-    today = date.today().isoformat()
-    last = progress.get("last_activity")
-    if last != today:
-        if last == (date.today().replace(day=date.today().day - 1)).isoformat() if date.today().day > 1 else None:
-            progress["streak_days"] = progress.get("streak_days", 0) + 1
-        elif last != today:
-            progress["streak_days"] = 1
-        progress["last_activity"] = today
-
-    # Award crowns for milestones
-    total_correct = sum(
-        e.get("correct", 0) for e in progress["exercises"].values() if isinstance(e, dict)
-    )
-    progress["crowns"] = total_correct // 20  # 1 crown per 20 correct answers
-
-    _save_progress(unit_id, progress)
-
-    return {
-        "coins_awarded": coins,
-        "total_coins": progress["coins"],
-        "crowns": progress["crowns"],
-        "streak_days": progress["streak_days"],
-    }
-
-
-@router.get("/")
-def list_all_progress():
-    """List progress for all units."""
-    _ensure_dir()
-    results = []
-    for f in Path(PROGRESS_DIR).glob("*.json"):
-        with open(f, "r", encoding="utf-8") as fh:
-            results.append(json.load(fh))
-    return results
+# Backward-compat shim -- module moved to api/progress.py
+import importlib as _importlib
+import sys as _sys
+_sys.modules[__name__] = _importlib.import_module("api.progress")