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

ent/permission/where.go

@@ -0,0 +1,68 @@
+// Code generated by ent, DO NOT EDIT.
+
+package permission
+
+import (
+	"entgo.io/ent/dialect/sql"
+	"git.dcentral.systems/toolz/goplt/ent/predicate"
+)
+
+// ID filters vertices based on their ID field.
+func ID(id int) predicate.Permission {
+	return predicate.Permission(sql.FieldEQ(FieldID, id))
+}
+
+// IDEQ applies the EQ predicate on the ID field.
+func IDEQ(id int) predicate.Permission {
+	return predicate.Permission(sql.FieldEQ(FieldID, id))
+}
+
+// IDNEQ applies the NEQ predicate on the ID field.
+func IDNEQ(id int) predicate.Permission {
+	return predicate.Permission(sql.FieldNEQ(FieldID, id))
+}
+
+// IDIn applies the In predicate on the ID field.
+func IDIn(ids ...int) predicate.Permission {
+	return predicate.Permission(sql.FieldIn(FieldID, ids...))
+}
+
+// IDNotIn applies the NotIn predicate on the ID field.
+func IDNotIn(ids ...int) predicate.Permission {
+	return predicate.Permission(sql.FieldNotIn(FieldID, ids...))
+}
+
+// IDGT applies the GT predicate on the ID field.
+func IDGT(id int) predicate.Permission {
+	return predicate.Permission(sql.FieldGT(FieldID, id))
+}
+
+// IDGTE applies the GTE predicate on the ID field.
+func IDGTE(id int) predicate.Permission {
+	return predicate.Permission(sql.FieldGTE(FieldID, id))
+}
+
+// IDLT applies the LT predicate on the ID field.
+func IDLT(id int) predicate.Permission {
+	return predicate.Permission(sql.FieldLT(FieldID, id))
+}
+
+// IDLTE applies the LTE predicate on the ID field.
+func IDLTE(id int) predicate.Permission {
+	return predicate.Permission(sql.FieldLTE(FieldID, id))
+}
+
+// And groups predicates with the AND operator between them.
+func And(predicates ...predicate.Permission) predicate.Permission {
+	return predicate.Permission(sql.AndPredicates(predicates...))
+}
+
+// Or groups predicates with the OR operator between them.
+func Or(predicates ...predicate.Permission) predicate.Permission {
+	return predicate.Permission(sql.OrPredicates(predicates...))
+}
+
+// Not applies the not operator on the given predicate.
+func Not(p predicate.Permission) predicate.Permission {
+	return predicate.Permission(sql.NotPredicates(p))
+}