refactor(safety): apply consistent formatting across services and tests

Improved code readability and uniformity by standardizing line breaks, indentation, and inline conditions across safety-related services, models, and tests, including content filters, validation rules, and emergency controls.

backend/app/services/safety/models.py

@@ -212,9 +212,7 @@ class ValidationResult(BaseModel):
     applied_rules: list[str] = Field(
         default_factory=list, description="IDs of applied rules"
     )
-    reasons: list[str] = Field(
-        default_factory=list, description="Reasons for decision"
-    )
+    reasons: list[str] = Field(default_factory=list, description="Reasons for decision")
     approval_id: str | None = Field(None, description="Approval request ID if needed")
     retry_after_seconds: float | None = Field(
         None, description="Retry delay if rate limited"
@@ -267,9 +265,7 @@ class RateLimitConfig(BaseModel):
     limit: int = Field(..., description="Maximum allowed in window")
     window_seconds: int = Field(60, description="Time window in seconds")
     burst_limit: int | None = Field(None, description="Burst allowance")
-    slowdown_threshold: float = Field(
-        0.8, description="Start slowing at this fraction"
-    )
+    slowdown_threshold: float = Field(0.8, description="Start slowing at this fraction")
 
 
 class RateLimitStatus(BaseModel):