refactor: migrate templates and static files to self-contained modules

Templates Migration:
- Migrate admin templates to modules (tenancy, billing, monitoring, marketplace, etc.)
- Migrate vendor templates to modules (tenancy, billing, orders, messaging, etc.)
- Migrate storefront templates to modules (catalog, customers, orders, cart, checkout, cms)
- Migrate public templates to modules (billing, marketplace, cms)
- Keep shared templates in app/templates/ (base.html, errors/, partials/, macros/)
- Migrate letzshop partials to marketplace module

Static Files Migration:
- Migrate admin JS to modules: tenancy (23 files), core (5 files), monitoring (1 file)
- Migrate vendor JS to modules: tenancy (4 files), core (2 files)
- Migrate shared JS: vendor-selector.js to core, media-picker.js to cms
- Migrate storefront JS: storefront-layout.js to core
- Keep framework JS in static/ (api-client, utils, money, icons, log-config, lib/)
- Update all template references to use module_static paths

Naming Consistency:
- Rename static/platform/ to static/public/
- Rename app/templates/platform/ to app/templates/public/
- Update all extends and static references

Documentation:
- Update module-system.md with shared templates documentation
- Update frontend-structure.md with new module JS organization

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/modules/monitoring/exceptions.py

@@ -2,14 +2,41 @@
 """
 Monitoring module exceptions.
 
-Module-specific exceptions for monitoring functionality.
+This module provides exception classes for monitoring operations including:
+- Background task tracking
+- Capacity snapshot management
+- Code quality/architecture scans
 """
 
 from app.exceptions.base import (
     BusinessLogicException,
+    ExternalServiceException,
     ResourceNotFoundException,
+    ValidationException,
 )
 
+__all__ = [
+    # Task exceptions
+    "TaskNotFoundException",
+    # Capacity exceptions
+    "CapacitySnapshotNotFoundException",
+    # General monitoring exceptions
+    "MonitoringServiceException",
+    # Code quality exceptions
+    "ViolationNotFoundException",
+    "ScanNotFoundException",
+    "ScanExecutionException",
+    "ScanTimeoutException",
+    "ScanParseException",
+    "ViolationOperationException",
+    "InvalidViolationStatusException",
+]
+
+
+# =============================================================================
+# Task Exceptions
+# =============================================================================
+
 
 class TaskNotFoundException(ResourceNotFoundException):
     """Raised when a background task is not found."""
@@ -22,6 +49,11 @@ class TaskNotFoundException(ResourceNotFoundException):
         )
 
 
+# =============================================================================
+# Capacity Exceptions
+# =============================================================================
+
+
 class CapacitySnapshotNotFoundException(ResourceNotFoundException):
     """Raised when a capacity snapshot is not found."""
 
@@ -33,6 +65,11 @@ class CapacitySnapshotNotFoundException(ResourceNotFoundException):
         )
 
 
+# =============================================================================
+# General Monitoring Exceptions
+# =============================================================================
+
+
 class MonitoringServiceException(BusinessLogicException):
     """Raised when a monitoring operation fails."""
 
@@ -40,11 +77,97 @@ class MonitoringServiceException(BusinessLogicException):
         super().__init__(
             message=f"Monitoring operation '{operation}' failed: {reason}",
             error_code="MONITORING_OPERATION_FAILED",
+            details={"operation": operation, "reason": reason},
         )
 
 
-__all__ = [
-    "TaskNotFoundException",
-    "CapacitySnapshotNotFoundException",
-    "MonitoringServiceException",
-]
+# =============================================================================
+# Code Quality Exceptions
+# =============================================================================
+
+
+class ViolationNotFoundException(ResourceNotFoundException):
+    """Raised when a violation is not found."""
+
+    def __init__(self, violation_id: int):
+        super().__init__(
+            resource_type="Violation",
+            identifier=str(violation_id),
+            error_code="VIOLATION_NOT_FOUND",
+        )
+
+
+class ScanNotFoundException(ResourceNotFoundException):
+    """Raised when a scan is not found."""
+
+    def __init__(self, scan_id: int):
+        super().__init__(
+            resource_type="Scan",
+            identifier=str(scan_id),
+            error_code="SCAN_NOT_FOUND",
+        )
+
+
+class ScanExecutionException(ExternalServiceException):
+    """Raised when architecture scan execution fails."""
+
+    def __init__(self, reason: str):
+        super().__init__(
+            service_name="ArchitectureValidator",
+            message=f"Scan execution failed: {reason}",
+            error_code="SCAN_EXECUTION_FAILED",
+        )
+
+
+class ScanTimeoutException(ExternalServiceException):
+    """Raised when architecture scan times out."""
+
+    def __init__(self, timeout_seconds: int = 300):
+        super().__init__(
+            service_name="ArchitectureValidator",
+            message=f"Scan timed out after {timeout_seconds} seconds",
+            error_code="SCAN_TIMEOUT",
+            details={"timeout_seconds": timeout_seconds},
+        )
+
+
+class ScanParseException(BusinessLogicException):
+    """Raised when scan results cannot be parsed."""
+
+    def __init__(self, reason: str):
+        super().__init__(
+            message=f"Failed to parse scan results: {reason}",
+            error_code="SCAN_PARSE_FAILED",
+            details={"reason": reason},
+        )
+
+
+class ViolationOperationException(BusinessLogicException):
+    """Raised when a violation operation fails."""
+
+    def __init__(self, operation: str, violation_id: int, reason: str):
+        super().__init__(
+            message=f"Failed to {operation} violation {violation_id}: {reason}",
+            error_code="VIOLATION_OPERATION_FAILED",
+            details={
+                "operation": operation,
+                "violation_id": violation_id,
+                "reason": reason,
+            },
+        )
+
+
+class InvalidViolationStatusException(ValidationException):
+    """Raised when a violation status transition is invalid."""
+
+    def __init__(self, violation_id: int, current_status: str, target_status: str):
+        super().__init__(
+            message=f"Cannot change violation {violation_id} from '{current_status}' to '{target_status}'",
+            field="status",
+            details={
+                "violation_id": violation_id,
+                "current_status": current_status,
+                "target_status": target_status,
+            },
+        )
+        self.error_code = "INVALID_VIOLATION_STATUS"