feat(epic1): implement core infrastructure (stories 1.1-1.5)

Implemented Epic 1 core kernel and infrastructure stories:

Story 1.1: Enhanced DI Container
- Added providers for database, health, metrics, and error bus
- Extended CoreModule to include all core services

Story 1.2: Database Layer with Ent ORM
- Created Ent schema for User, Role, Permission, AuditLog entities
- Implemented many-to-many relationships (User-Role, Role-Permission)
- Created database client wrapper with connection pooling
- Added database provider to DI container with migration support

Story 1.3: Health Monitoring and Metrics System
- Implemented health check registry and interface
- Added database health checker
- Created Prometheus metrics system with HTTP instrumentation
- Added health and metrics providers to DI container

Story 1.4: Error Handling and Error Bus
- Implemented channel-based error bus
- Created ErrorPublisher interface
- Added error bus provider with lifecycle management

Story 1.5: HTTP Server Foundation
- Created HTTP server with Gin framework
- Implemented comprehensive middleware stack:
  - Request ID generation
  - Structured logging
  - Panic recovery with error bus integration
  - Prometheus metrics collection
  - CORS support
- Registered core routes: /healthz, /ready, /metrics
- Integrated with FX lifecycle for graceful shutdown

All components are integrated via DI container and ready for use.

internal/ent/schema/audit_log.go

@@ -0,0 +1,49 @@
+package schema
+
+import (
+	"time"
+
+	"entgo.io/ent"
+	"entgo.io/ent/schema/field"
+	"entgo.io/ent/schema/index"
+)
+
+// AuditLog holds the schema definition for the AuditLog entity.
+type AuditLog struct {
+	ent.Schema
+}
+
+// Fields of the AuditLog.
+func (AuditLog) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("id").
+			Unique().
+			Immutable(),
+		field.String("actor_id").
+			NotEmpty().
+			Comment("ID of the user/actor performing the action"),
+		field.String("action").
+			NotEmpty().
+			Comment("Action performed (e.g., create, update, delete)"),
+		field.String("target_id").
+			Optional().
+			Comment("ID of the target resource"),
+		field.JSON("metadata", map[string]interface{}{}).
+			Optional().
+			Comment("Additional metadata as JSON"),
+		field.Time("timestamp").
+			Default(time.Now).
+			Immutable(),
+	}
+}
+
+// Indexes of the AuditLog.
+func (AuditLog) Indexes() []ent.Index {
+	return []ent.Index{
+		index.Fields("actor_id"),
+		index.Fields("target_id"),
+		index.Fields("timestamp"),
+		index.Fields("action"),
+	}
+}
+