feat(epic2): Implement core authentication and authorization services

- Implement Audit Service (2.5)
  - gRPC server with Record and Query operations
  - Database persistence with audit schema
  - Service registry integration
  - Entry point: cmd/audit-service

- Implement Identity Service (2.2)
  - User CRUD operations
  - Password hashing with argon2id
  - Email verification and password reset flows
  - Entry point: cmd/identity-service
  - Fix package naming conflicts in user_service.go

- Implement Auth Service (2.1)
  - JWT token generation and validation
  - Login, RefreshToken, ValidateToken, Logout RPCs
  - Integration with Identity Service
  - Entry point: cmd/auth-service
  - Note: RefreshToken entity needs Ent generation

- Implement Authz Service (2.3, 2.4)
  - Permission checking and authorization
  - User roles and permissions retrieval
  - RBAC-based authorization
  - Entry point: cmd/authz-service

- Implement gRPC clients for all services
  - Auth, Identity, Authz, and Audit clients
  - Service discovery integration
  - Full gRPC communication

- Add service configurations to config/default.yaml
- Create SUMMARY.md with implementation details and testing instructions
- Fix compilation errors in Identity Service (password package conflicts)
- All services build successfully and tests pass

internal/ent/auditlog/auditlog.go

@@ -13,12 +13,18 @@ const (
 	Label = "audit_log"
 	// FieldID holds the string denoting the id field in the database.
 	FieldID = "id"
-	// FieldActorID holds the string denoting the actor_id field in the database.
-	FieldActorID = "actor_id"
+	// FieldUserID holds the string denoting the user_id field in the database.
+	FieldUserID = "user_id"
 	// FieldAction holds the string denoting the action field in the database.
 	FieldAction = "action"
-	// FieldTargetID holds the string denoting the target_id field in the database.
-	FieldTargetID = "target_id"
+	// FieldResource holds the string denoting the resource field in the database.
+	FieldResource = "resource"
+	// FieldResourceID holds the string denoting the resource_id field in the database.
+	FieldResourceID = "resource_id"
+	// FieldIPAddress holds the string denoting the ip_address field in the database.
+	FieldIPAddress = "ip_address"
+	// FieldUserAgent holds the string denoting the user_agent field in the database.
+	FieldUserAgent = "user_agent"
 	// FieldMetadata holds the string denoting the metadata field in the database.
 	FieldMetadata = "metadata"
 	// FieldTimestamp holds the string denoting the timestamp field in the database.
@@ -30,9 +36,12 @@ const (
 // Columns holds all SQL columns for auditlog fields.
 var Columns = []string{
 	FieldID,
-	FieldActorID,
+	FieldUserID,
 	FieldAction,
-	FieldTargetID,
+	FieldResource,
+	FieldResourceID,
+	FieldIPAddress,
+	FieldUserAgent,
 	FieldMetadata,
 	FieldTimestamp,
 }
@@ -48,8 +57,8 @@ func ValidColumn(column string) bool {
 }
 
 var (
-	// ActorIDValidator is a validator for the "actor_id" field. It is called by the builders before save.
-	ActorIDValidator func(string) error
+	// UserIDValidator is a validator for the "user_id" field. It is called by the builders before save.
+	UserIDValidator func(string) error
 	// ActionValidator is a validator for the "action" field. It is called by the builders before save.
 	ActionValidator func(string) error
 	// DefaultTimestamp holds the default value on creation for the "timestamp" field.
@@ -64,9 +73,9 @@ func ByID(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldID, opts...).ToFunc()
 }
 
-// ByActorID orders the results by the actor_id field.
-func ByActorID(opts ...sql.OrderTermOption) OrderOption {
-	return sql.OrderByField(FieldActorID, opts...).ToFunc()
+// ByUserID orders the results by the user_id field.
+func ByUserID(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldUserID, opts...).ToFunc()
 }
 
 // ByAction orders the results by the action field.
@@ -74,9 +83,24 @@ func ByAction(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldAction, opts...).ToFunc()
 }
 
-// ByTargetID orders the results by the target_id field.
-func ByTargetID(opts ...sql.OrderTermOption) OrderOption {
-	return sql.OrderByField(FieldTargetID, opts...).ToFunc()
+// ByResource orders the results by the resource field.
+func ByResource(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldResource, opts...).ToFunc()
+}
+
+// ByResourceID orders the results by the resource_id field.
+func ByResourceID(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldResourceID, opts...).ToFunc()
+}
+
+// ByIPAddress orders the results by the ip_address field.
+func ByIPAddress(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldIPAddress, opts...).ToFunc()
+}
+
+// ByUserAgent orders the results by the user_agent field.
+func ByUserAgent(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldUserAgent, opts...).ToFunc()
 }
 
 // ByTimestamp orders the results by the timestamp field.