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/memory.go

@@ -0,0 +1,74 @@
+package cache
+
+import (
+	"context"
+	"sync"
+	"time"
+)
+
+type memoryEntry struct {
+	data      []byte
+	expiresAt time.Time
+}
+
+type memoryCache struct {
+	mu      sync.RWMutex
+	entries map[string]memoryEntry
+}
+
+func newMemoryCache() Cache {
+	c := &memoryCache{entries: make(map[string]memoryEntry)}
+	go c.evictLoop()
+	return c
+}
+
+func (c *memoryCache) Get(_ context.Context, key string) ([]byte, error) {
+	c.mu.RLock()
+	entry, ok := c.entries[key]
+	c.mu.RUnlock()
+
+	if !ok || time.Now().After(entry.expiresAt) {
+		if ok {
+			c.mu.Lock()
+			delete(c.entries, key)
+			c.mu.Unlock()
+		}
+		return nil, ErrNotFound
+	}
+
+	dst := make([]byte, len(entry.data))
+	copy(dst, entry.data)
+	return dst, nil
+}
+
+func (c *memoryCache) Set(_ context.Context, key string, value []byte, ttl time.Duration) error {
+	dst := make([]byte, len(value))
+	copy(dst, value)
+
+	c.mu.Lock()
+	c.entries[key] = memoryEntry{data: dst, expiresAt: time.Now().Add(ttl)}
+	c.mu.Unlock()
+	return nil
+}
+
+func (c *memoryCache) Delete(_ context.Context, key string) error {
+	c.mu.Lock()
+	delete(c.entries, key)
+	c.mu.Unlock()
+	return nil
+}
+
+func (c *memoryCache) evictLoop() {
+	ticker := time.NewTicker(60 * time.Second)
+	defer ticker.Stop()
+	for range ticker.C {
+		now := time.Now()
+		c.mu.Lock()
+		for k, v := range c.entries {
+			if now.After(v.expiresAt) {
+				delete(c.entries, k)
+			}
+		}
+		c.mu.Unlock()
+	}
+}