refactor: enforce strict architecture rules and add Pydantic response models

- Update architecture rules to be stricter (API-003 now blocks ALL exception
  raising in endpoints, not just HTTPException)
- Update get_current_vendor_api dependency to guarantee token_vendor_id presence
- Remove redundant _get_vendor_from_token helpers from all vendor API files
- Move vendor access validation to service layer methods
- Add Pydantic response models for media, notification, and payment endpoints
- Add get_active_vendor_by_code service method for public vendor lookup
- Add get_import_job_for_vendor service method with vendor validation
- Update validation script to detect exception raising patterns in endpoints

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

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

models/schema/notification.py

@@ -1 +1,151 @@
-# Notification models
+# models/schema/notification.py
+"""
+Notification Pydantic schemas for API validation and responses.
+
+This module provides schemas for:
+- Vendor notifications (list, read, delete)
+- Notification settings management
+- Notification email templates
+- Unread counts and statistics
+"""
+
+from datetime import datetime
+from typing import Any
+
+from pydantic import BaseModel, Field
+
+
+# ============================================================================
+# SHARED RESPONSE SCHEMAS
+# ============================================================================
+
+
+class MessageResponse(BaseModel):
+    """Generic message response for simple operations."""
+
+    message: str
+
+
+class UnreadCountResponse(BaseModel):
+    """Response for unread notification count."""
+
+    unread_count: int
+    message: str | None = None
+
+
+# ============================================================================
+# NOTIFICATION SCHEMAS
+# ============================================================================
+
+
+class NotificationResponse(BaseModel):
+    """Single notification response."""
+
+    id: int
+    type: str
+    title: str
+    message: str
+    is_read: bool
+    read_at: datetime | None = None
+    priority: str = "normal"
+    action_url: str | None = None
+    metadata: dict[str, Any] | None = None
+    created_at: datetime
+
+    model_config = {"from_attributes": True}
+
+
+class NotificationListResponse(BaseModel):
+    """Paginated list of notifications."""
+
+    notifications: list[NotificationResponse] = []
+    total: int = 0
+    unread_count: int = 0
+    message: str | None = None
+
+
+# ============================================================================
+# NOTIFICATION SETTINGS SCHEMAS
+# ============================================================================
+
+
+class NotificationSettingsResponse(BaseModel):
+    """Notification preferences response."""
+
+    email_notifications: bool = True
+    in_app_notifications: bool = True
+    notification_types: dict[str, bool] = Field(default_factory=dict)
+    message: str | None = None
+
+
+class NotificationSettingsUpdate(BaseModel):
+    """Request model for updating notification settings."""
+
+    email_notifications: bool | None = None
+    in_app_notifications: bool | None = None
+    notification_types: dict[str, bool] | None = None
+
+
+# ============================================================================
+# NOTIFICATION TEMPLATE SCHEMAS
+# ============================================================================
+
+
+class NotificationTemplateResponse(BaseModel):
+    """Single notification template response."""
+
+    id: int
+    name: str
+    type: str
+    subject: str
+    body_html: str | None = None
+    body_text: str | None = None
+    variables: list[str] = Field(default_factory=list)
+    is_active: bool = True
+    created_at: datetime
+    updated_at: datetime | None = None
+
+    model_config = {"from_attributes": True}
+
+
+class NotificationTemplateListResponse(BaseModel):
+    """List of notification templates."""
+
+    templates: list[NotificationTemplateResponse] = []
+    message: str | None = None
+
+
+class NotificationTemplateUpdate(BaseModel):
+    """Request model for updating notification template."""
+
+    subject: str | None = Field(None, max_length=200)
+    body_html: str | None = None
+    body_text: str | None = None
+    is_active: bool | None = None
+
+
+# ============================================================================
+# TEST NOTIFICATION SCHEMA
+# ============================================================================
+
+
+class TestNotificationRequest(BaseModel):
+    """Request model for sending test notification."""
+
+    template_id: int | None = Field(None, description="Template to use")
+    email: str | None = Field(None, description="Override recipient email")
+    notification_type: str = Field(default="test", description="Type of notification to send")
+
+
+# ============================================================================
+# ADMIN ALERT STATISTICS SCHEMA
+# ============================================================================
+
+
+class AlertStatisticsResponse(BaseModel):
+    """Response for alert statistics."""
+
+    total_alerts: int = 0
+    active_alerts: int = 0
+    critical_alerts: int = 0
+    resolved_today: int = 0