feat(server): initialize project skeleton with db and api setup

Establish the foundational structure for the ez-api server.

Key changes include:
- Set up main entry point with graceful shutdown and Gin router
- Configure database connections for PostgreSQL (GORM) and Redis
- Define core data models (User, Provider, Key, Model)
- Implement configuration loading and basic key creation handler
- Add Dockerfile for multi-stage builds and .gitignore

internal/service/sync.go

@@ -0,0 +1,44 @@
+package service
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+
+	"github.com/ez-api/ez-api/internal/model"
+	"github.com/redis/go-redis/v9"
+)
+
+type SyncService struct {
+	rdb *redis.Client
+}
+
+func NewSyncService(rdb *redis.Client) *SyncService {
+	return &SyncService{rdb: rdb}
+}
+
+func (s *SyncService) SyncKey(key *model.Key) error {
+	// Hash the token
+	hasher := sha256.New()
+	hasher.Write([]byte(key.KeySecret))
+	tokenHash := hex.EncodeToString(hasher.Sum(nil))
+
+	redisKey := fmt.Sprintf("auth:token:%s", tokenHash)
+
+	// Store in Redis
+	// Using HSet to store multiple fields
+	fields := map[string]interface{}{
+		"status":  key.Status,
+		"balance": key.Balance,
+	}
+	if key.ProviderID != nil {
+		fields["master_id"] = *key.ProviderID
+	} else {
+		fields["master_id"] = 0 // Default or handle as needed
+	}
+
+	err := s.rdb.HSet(context.Background(), redisKey, fields).Err()
+
+	return err
+}