Увеличен лимит очков до 1000 и добавлена документация

- Максимум очков за челлендж/прохождение: 500 → 1000
- Добавлена документация по системе типов игр (docs/game-types.md)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/app/schemas/game.py

@@ -20,7 +20,7 @@ class GameCreate(GameBase):
     game_type: GameType = GameType.CHALLENGES
 
     # Поля для типа "Прохождение"
-    playthrough_points: int | None = Field(None, ge=1, le=500)
+    playthrough_points: int | None = Field(None, ge=1, le=1000)
     playthrough_description: str | None = None
     playthrough_proof_type: ProofType | None = None
     playthrough_proof_hint: str | None = None
@@ -46,7 +46,7 @@ class GameUpdate(BaseModel):
     game_type: GameType | None = None
 
     # Поля для типа "Прохождение"
-    playthrough_points: int | None = Field(None, ge=1, le=500)
+    playthrough_points: int | None = Field(None, ge=1, le=1000)
     playthrough_description: str | None = None
     playthrough_proof_type: ProofType | None = None
     playthrough_proof_hint: str | None = None