DNF90 服务端与启动器完整源码（含 GM 工具功能增强）

服务端（Go）：
- GM 塞背包/带属性装备发放：在线角色推送 op14 增量物品行，背包实时刷新，无需回角色选择界面
- GM 改金币/改等级：去掉在线拒绝，落库后推送 op14 钱包/op37 等级状态，在线实时刷新
- 等级端点统一切换到新版 GMSetCharacterLevel（自带在线刷新）
- 无限/锁死疲劳模式 + 燃烧疲劳：每房间消耗 2 点、打怪与通关经验双倍
- 燃烧疲劳开关时给所有在线角色推送系统提示（op12 mode 0）
- 深渊史诗掉率：GM 全局倍率 + 城镇增益药剂窗口倍率，真实接入掉落结算

启动器（Python/JS）：
- 标题栏自绘、窗口 1204x717、禁止拖拽改大小、仅最小化/关闭
- GM 工具：疲劳与燃烧、深渊史诗掉率、拍卖行上架（单一定价对齐）
- 拍卖行上架前端对齐服务端单一价格语义，修复 400 报错

server/internal/platform/accountcenter/sql.go

@@ -0,0 +1,135 @@
+package accountcenter
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+var (
+	ErrSQLDBRequired = errors.New("account center sql db is required")
+	ErrInvalidTable  = errors.New("account center sql table is invalid")
+)
+
+const (
+	defaultSQLTable = "account_center_state"
+	sqlStateName    = "default"
+)
+
+var sqlTablePattern = regexp.MustCompile(`^[A-Za-z0-9_]+$`)
+
+type SQLStore struct {
+	db    *sql.DB
+	stmts SQLStatements
+}
+
+type SQLOptions struct {
+	DB    *sql.DB
+	Table string
+}
+
+type SQLStatements struct {
+	Table        string
+	EnsureSchema string
+	Load         string
+	Save         string
+}
+
+func NewSQLStore(options SQLOptions) (*SQLStore, error) {
+	if options.DB == nil {
+		return nil, ErrSQLDBRequired
+	}
+	stmts, err := NewSQLStatements(options.Table)
+	if err != nil {
+		return nil, err
+	}
+	return &SQLStore{db: options.DB, stmts: stmts}, nil
+}
+
+func NewSQLStatements(table string) (SQLStatements, error) {
+	table, err := normalizeSQLTable(table)
+	if err != nil {
+		return SQLStatements{}, err
+	}
+	quoted := "`" + table + "`"
+	return SQLStatements{
+		Table: table,
+		EnsureSchema: fmt.Sprintf(`CREATE TABLE IF NOT EXISTS %s (
+  name VARCHAR(64) NOT NULL,
+  payload LONGTEXT NOT NULL,
+  updated_at TIMESTAMP(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6),
+  PRIMARY KEY (name)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`, quoted),
+		Load: fmt.Sprintf(`SELECT payload FROM %s WHERE name=?`, quoted),
+		Save: fmt.Sprintf(`INSERT INTO %s (name, payload) VALUES (?, ?) ON DUPLICATE KEY UPDATE payload=VALUES(payload), updated_at=CURRENT_TIMESTAMP(6)`, quoted),
+	}, nil
+}
+
+func (s *SQLStore) EnsureSchema(ctx context.Context) error {
+	if err := ctxErr(ctx); err != nil {
+		return err
+	}
+	if s == nil || s.db == nil {
+		return ErrSQLDBRequired
+	}
+	_, err := s.db.ExecContext(ctx, s.stmts.EnsureSchema)
+	return err
+}
+
+func (s *SQLStore) Load(ctx context.Context) (Export, bool, error) {
+	if err := ctxErr(ctx); err != nil {
+		return Export{}, false, err
+	}
+	if s == nil || s.db == nil {
+		return Export{}, false, ErrSQLDBRequired
+	}
+	var payload []byte
+	if err := s.db.QueryRowContext(ctx, s.stmts.Load, sqlStateName).Scan(&payload); err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return Export{}, false, nil
+		}
+		return Export{}, false, err
+	}
+	var exported Export
+	if err := json.Unmarshal(payload, &exported); err != nil {
+		return Export{}, false, err
+	}
+	return exported, true, nil
+}
+
+func (s *SQLStore) Save(ctx context.Context, exported Export) error {
+	if err := ctxErr(ctx); err != nil {
+		return err
+	}
+	if s == nil || s.db == nil {
+		return ErrSQLDBRequired
+	}
+	payload, err := json.Marshal(exported)
+	if err != nil {
+		return err
+	}
+	_, err = s.db.ExecContext(ctx, s.stmts.Save, sqlStateName, payload)
+	return err
+}
+
+func (s *SQLStore) Close() error {
+	if s == nil || s.db == nil {
+		return nil
+	}
+	return s.db.Close()
+}
+
+func normalizeSQLTable(table string) (string, error) {
+	table = strings.TrimSpace(table)
+	if table == "" {
+		table = defaultSQLTable
+	}
+	if !sqlTablePattern.MatchString(table) {
+		return "", ErrInvalidTable
+	}
+	return table, nil
+}