feat(migrations): Harden task audit tracking and optimize article templates

- Added migration to harden task audit tracking by modifying audit_logs and related tables.
- Introduced operator_id to several tables for better tracking of actions.
- Updated article_templates with new prompt templates for various article types, enhancing content generation.
- Created prompt_rules and schedule_tasks tables to manage content generation rules and scheduling.
- Added foreign key constraints to articles for better data integrity.

server/internal/shared/cache/cache.go

@@ -0,0 +1,15 @@
+package cache
+
+import (
+	"context"
+	"errors"
+	"time"
+)
+
+var ErrNotFound = errors.New("cache: key not found")
+
+type Cache interface {
+	Get(ctx context.Context, key string) ([]byte, error)
+	Set(ctx context.Context, key string, value []byte, ttl time.Duration) error
+	Delete(ctx context.Context, key string) error
+}