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/challenge.py

@@ -19,7 +19,7 @@ class ChallengeBase(BaseModel):
     description: str = Field(..., min_length=1)
     type: ChallengeType
     difficulty: Difficulty
-    points: int = Field(..., ge=1, le=500)
+    points: int = Field(..., ge=1, le=1000)
     estimated_time: int | None = Field(None, ge=1)  # minutes
     proof_type: ProofType
     proof_hint: str | None = None
@@ -34,7 +34,7 @@ class ChallengeUpdate(BaseModel):
     description: str | None = None
     type: ChallengeType | None = None
     difficulty: Difficulty | None = None
-    points: int | None = Field(None, ge=1, le=500)
+    points: int | None = Field(None, ge=1, le=1000)
     estimated_time: int | None = None
     proof_type: ProofType | None = None
     proof_hint: str | None = None