Refactor code for improved readability and consistency

- Reformatted function signatures in `organization_service.py` and `task_service.py` for better alignment.
- Updated import statements across multiple files for consistency and organization.
- Enhanced test files by improving formatting and ensuring consistent use of async session factories.
- Added type hints and improved type safety in various service and test files.
- Adjusted `pyproject.toml` to include configuration for isort, mypy, and ruff for better code quality checks.
- Cleaned up unused imports and organized existing ones in several test files.

app/core/config.py

@@ -1,4 +1,5 @@
 """Application settings using Pydantic Settings."""
+
 from pydantic import Field, SecretStr
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
@@ -15,7 +16,9 @@ class Settings(BaseSettings):
     db_port: int = Field(default=5432, description="Database port")
     db_name: str = Field(default="test_task_crm", description="Database name")
     db_user: str = Field(default="postgres", description="Database user")
-    db_password: SecretStr = Field(default=SecretStr("postgres"), description="Database user password")
+    db_password: SecretStr = Field(
+        default=SecretStr("postgres"), description="Database user password"
+    )
     database_url_override: str | None = Field(
         default=None,
         alias="DATABASE_URL",
@@ -28,7 +31,9 @@ class Settings(BaseSettings):
     refresh_token_expire_days: int = 7
     redis_enabled: bool = Field(default=False, description="Toggle Redis-backed cache usage")
     redis_url: str = Field(default="redis://localhost:6379/0", description="Redis connection URL")
-    analytics_cache_ttl_seconds: int = Field(default=120, ge=1, description="TTL for cached analytics responses")
+    analytics_cache_ttl_seconds: int = Field(
+        default=120, ge=1, description="TTL for cached analytics responses"
+    )
     analytics_cache_backoff_ms: int = Field(
         default=200,
         ge=0,