refactor: modernize code quality tooling with Ruff

- Replace black, isort, and flake8 with Ruff (all-in-one linter and formatter)
- Add comprehensive pyproject.toml configuration
- Simplify Makefile code quality targets
- Configure exclusions for venv/.venv in pyproject.toml
- Auto-fix 1,359 linting issues across codebase

Benefits:
- Much faster builds (Ruff is written in Rust)
- Single tool replaces multiple tools
- More comprehensive rule set (UP, B, C4, SIM, PIE, RET, Q)
- All configuration centralized in pyproject.toml
- Better import sorting and formatting consistency

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

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

scripts/validate_architecture.py

@@ -25,7 +25,7 @@ import sys
 from dataclasses import dataclass, field
 from enum import Enum
 from pathlib import Path
-from typing import Any, Dict, List, Tuple
+from typing import Any
 
 import yaml
 
@@ -56,7 +56,7 @@ class Violation:
 class ValidationResult:
     """Results of architecture validation"""
 
-    violations: List[Violation] = field(default_factory=list)
+    violations: list[Violation] = field(default_factory=list)
     files_checked: int = 0
     rules_applied: int = 0
 
@@ -80,13 +80,13 @@ class ArchitectureValidator:
         self.result = ValidationResult()
         self.project_root = Path.cwd()
 
-    def _load_config(self) -> Dict[str, Any]:
+    def _load_config(self) -> dict[str, Any]:
         """Load validation rules from YAML config"""
         if not self.config_path.exists():
             print(f"❌ Configuration file not found: {self.config_path}")
             sys.exit(1)
 
-        with open(self.config_path, "r") as f:
+        with open(self.config_path) as f:
             config = yaml.safe_load(f)
 
         print(f"📋 Loaded architecture rules: {config.get('project', 'unknown')}")
@@ -144,7 +144,7 @@ class ArchitectureValidator:
             # API-004: Check authentication
             self._check_endpoint_authentication(file_path, content, lines)
 
-    def _check_pydantic_usage(self, file_path: Path, content: str, lines: List[str]):
+    def _check_pydantic_usage(self, file_path: Path, content: str, lines: list[str]):
         """API-001: Ensure endpoints use Pydantic models"""
         rule = self._get_rule("API-001")
         if not rule:
@@ -180,7 +180,7 @@ class ArchitectureValidator:
                         )
 
     def _check_no_business_logic_in_endpoints(
-        self, file_path: Path, content: str, lines: List[str]
+        self, file_path: Path, content: str, lines: list[str]
     ):
         """API-002: Ensure no business logic in endpoints"""
         rule = self._get_rule("API-002")
@@ -213,7 +213,7 @@ class ArchitectureValidator:
                     )
 
     def _check_endpoint_exception_handling(
-        self, file_path: Path, content: str, lines: List[str]
+        self, file_path: Path, content: str, lines: list[str]
     ):
         """API-003: Check proper exception handling in endpoints"""
         rule = self._get_rule("API-003")
@@ -263,7 +263,7 @@ class ArchitectureValidator:
                         )
 
     def _check_endpoint_authentication(
-        self, file_path: Path, content: str, lines: List[str]
+        self, file_path: Path, content: str, lines: list[str]
     ):
         """API-004: Check authentication on endpoints"""
         rule = self._get_rule("API-004")
@@ -321,7 +321,7 @@ class ArchitectureValidator:
             self._check_db_session_parameter(file_path, content, lines)
 
     def _check_no_http_exception_in_services(
-        self, file_path: Path, content: str, lines: List[str]
+        self, file_path: Path, content: str, lines: list[str]
     ):
         """SVC-001: Services must not raise HTTPException"""
         rule = self._get_rule("SVC-001")
@@ -357,7 +357,7 @@ class ArchitectureValidator:
                 )
 
     def _check_service_exceptions(
-        self, file_path: Path, content: str, lines: List[str]
+        self, file_path: Path, content: str, lines: list[str]
     ):
         """SVC-002: Check for proper exception handling"""
         rule = self._get_rule("SVC-002")
@@ -379,7 +379,7 @@ class ArchitectureValidator:
                 )
 
     def _check_db_session_parameter(
-        self, file_path: Path, content: str, lines: List[str]
+        self, file_path: Path, content: str, lines: list[str]
     ):
         """SVC-003: Service methods should accept db session as parameter"""
         rule = self._get_rule("SVC-003")
@@ -536,7 +536,7 @@ class ArchitectureValidator:
                     suggestion="Add {% extends 'admin/base.html' %} at the top",
                 )
 
-    def _get_rule(self, rule_id: str) -> Dict[str, Any]:
+    def _get_rule(self, rule_id: str) -> dict[str, Any]:
         """Get rule configuration by ID"""
         # Look in different rule categories
         for category in [
@@ -618,14 +618,13 @@ class ArchitectureValidator:
             print("❌ VALIDATION FAILED - Fix errors before committing")
             print("=" * 80)
             return 1
-        elif self.result.has_warnings():
+        if self.result.has_warnings():
             print("⚠️  VALIDATION PASSED WITH WARNINGS")
             print("=" * 80)
             return 0
-        else:
-            print("✅ VALIDATION PASSED - No violations found")
-            print("=" * 80)
-            return 0
+        print("✅ VALIDATION PASSED - No violations found")
+        print("=" * 80)
+        return 0
 
     def print_json(self) -> int:
         """Print validation results as JSON"""