chore(content): merge content full implementation into main

Merge feat/content-ai09 with complete content service

services/content/src/shared/errors/application-error.ts

@@ -1,11 +1,12 @@
 export type ErrorType =
-  | 'validation'
-  | 'not_found'
-  | 'permission_denied'
-  | 'conflict'
-  | 'business'
-  | 'database'
-  | 'internal';
+  | "validation"
+  | "not_found"
+  | "permission_denied"
+  | "conflict"
+  | "business"
+  | "database"
+  | "internal"
+  | "neo4j_unavailable";
 
 export interface ErrorDetails {
   [key: string]: unknown;
@@ -40,57 +41,70 @@ export abstract class ApplicationError extends Error {
 }
 
 export class ValidationError extends ApplicationError {
-  readonly type = 'validation' as const;
+  readonly type = "validation" as const;
   readonly statusCode = 400;
   constructor(message: string, details?: ErrorDetails) {
-    super(message, 'CONTENT_VALIDATION_ERROR', details);
+    super(message, "CONTENT_VALIDATION_ERROR", details);
   }
 }
 
 export class NotFoundError extends ApplicationError {
-  readonly type = 'not_found' as const;
+  readonly type = "not_found" as const;
   readonly statusCode = 404;
   constructor(resource: string, id: string) {
-    super(`${resource} not found: ${id}`, 'CONTENT_NOT_FOUND', { resource, id });
+    super(`${resource} not found: ${id}`, "CONTENT_NOT_FOUND", {
+      resource,
+      id,
+    });
   }
 }
 
 export class PermissionDeniedError extends ApplicationError {
-  readonly type = 'permission_denied' as const;
+  readonly type = "permission_denied" as const;
   readonly statusCode = 403;
   constructor(permission: string) {
-    super(`Permission denied: ${permission}`, 'CONTENT_PERMISSION_DENIED', { permission });
+    super(`Permission denied: ${permission}`, "CONTENT_PERMISSION_DENIED", {
+      permission,
+    });
   }
 }
 
 export class ConflictError extends ApplicationError {
-  readonly type = 'conflict' as const;
+  readonly type = "conflict" as const;
   readonly statusCode = 409;
   constructor(message: string, details?: ErrorDetails) {
-    super(message, 'CONTENT_CONFLICT', details);
+    super(message, "CONTENT_CONFLICT", details);
   }
 }
 
 export class BusinessError extends ApplicationError {
-  readonly type = 'business' as const;
+  readonly type = "business" as const;
   readonly statusCode = 422;
   constructor(message: string, details?: ErrorDetails) {
-    super(message, 'CONTENT_BUSINESS_ERROR', details);
+    super(message, "CONTENT_BUSINESS_ERROR", details);
   }
 }
 
 export class DatabaseError extends ApplicationError {
-  readonly type = 'database' as const;
+  readonly type = "database" as const;
   readonly statusCode = 500;
   constructor(message: string, details?: ErrorDetails) {
-    super(message, 'CONTENT_DATABASE_ERROR', details);
+    super(message, "CONTENT_DATABASE_ERROR", details);
   }
 }
 
 export class InternalError extends ApplicationError {
-  readonly type = 'internal' as const;
+  readonly type = "internal" as const;
   readonly statusCode = 500;
   constructor(message: string, details?: ErrorDetails) {
-    super(message, 'CONTENT_INTERNAL_ERROR', details);
+    super(message, "CONTENT_INTERNAL_ERROR", details);
+  }
+}
+
+export class Neo4jUnavailableError extends ApplicationError {
+  readonly type = "neo4j_unavailable" as const;
+  readonly statusCode = 503;
+  constructor(message: string, details?: ErrorDetails) {
+    super(message, "CONTENT_NEO4J_UNAVAILABLE", details);
   }
 }