diff --git a/.env.example b/.env.example
index f2a61c8..1620837 100644
--- a/.env.example
+++ b/.env.example
@@ -6,8 +6,9 @@ ADMIN_PASSWORD=infinite-canvas
 JWT_SECRET=infinite-canvas
 JWT_EXPIRE_HOURS=168
 
-# 后端监听端口
-PORT=8080
+# 后端默认监听 8080，如需本地开发修改端口再取消注释。
+# Docker 镜像内前端固定监听 3000，避免覆盖前端 PORT。
+# PORT=8080
 
 # 公开访问地址，用于把本地上传的 Seedance 参考图/视频暴露给火山方舟拉取。
 # 线上部署时填写站点根地址，例如：https://your-domain.example.com
@@ -21,6 +22,8 @@ NEXT_PUBLIC_DOC_URL=https://docs.canvas.best
 STORAGE_DRIVER=sqlite
 # sqlite: DATABASE_DSN=data/infinite-canvas.db
 # Docker 部署时建议使用绝对路径，避免工作目录变化后写入临时库：DATABASE_DSN=/app/data/infinite-canvas.db
+# mysql 目标库不存在时会尝试自动创建，账号需有 CREATE 权限。
 # mysql: DATABASE_DSN=user:password@tcp(127.0.0.1:3306)/infinite_canvas?parseTime=true
+# postgres 目标库不存在时会尝试自动创建，账号需有 CREATEDB 权限。
 # postgres: DATABASE_DSN=postgres://user:password@127.0.0.1:5432/infinite_canvas?sslmode=disable
 DATABASE_DSN=data/infinite-canvas.db
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0becd45..5f53ef2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
++ [新增] 新增图片放大工具。
++ [优化] 优化图片工具条，增加自定义功能。
++ [修复] 修复端口冲突问题、pg/mysql未初始化问题。
+
 ## v0.2.1 - 2026-06-03
 
 + [新增] 新增文档站点页面。
diff --git a/Dockerfile b/Dockerfile
index 854d1d5..ccf710c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -43,4 +43,4 @@ RUN mkdir -p /app/data/prompts
 
 EXPOSE 3000
 # 先启动内部 Go API，再由 Next.js 提供页面并代理 /api/*。
-CMD ["sh", "-c", "PORT=8080 /app/server & cd /app/web && node server.js"]
+CMD ["sh", "-c", "PORT=8080 /app/server & cd /app/web && PORT=3000 node server.js"]
diff --git a/go.mod b/go.mod
index 5891d74..24c404d 100644
--- a/go.mod
+++ b/go.mod
@@ -7,6 +7,8 @@ require (
 	github.com/gin-gonic/gin v1.11.0
 	github.com/glebarez/sqlite v1.11.0
 	github.com/golang-jwt/jwt/v5 v5.3.1
+	github.com/go-sql-driver/mysql v1.8.1
+	github.com/jackc/pgx/v5 v5.6.0
 	github.com/joho/godotenv v1.5.1
 	github.com/robfig/cron/v3 v3.0.1
 	golang.org/x/crypto v0.48.0
@@ -27,13 +29,11 @@ require (
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.27.0 // indirect
-	github.com/go-sql-driver/mysql v1.8.1 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/goccy/go-yaml v1.18.0 // indirect
 	github.com/google/uuid v1.3.0
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/pgx/v5 v5.6.0 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
diff --git a/repository/db.go b/repository/db.go
index aed850a..4948d76 100644
--- a/repository/db.go
+++ b/repository/db.go
@@ -1,6 +1,9 @@
 package repository
 
 import (
+	"context"
+	"database/sql"
+	"errors"
 	"os"
 	"path/filepath"
 	"strings"
@@ -9,7 +12,10 @@ import (
 	"github.com/basketikun/infinite-canvas/config"
 	"github.com/basketikun/infinite-canvas/model"
 	"github.com/glebarez/sqlite"
-	"gorm.io/driver/mysql"
+	mysqldriver "github.com/go-sql-driver/mysql"
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
+	gormmysql "gorm.io/driver/mysql"
 	"gorm.io/driver/postgres"
 	"gorm.io/gorm"
 )
@@ -41,6 +47,18 @@ func DB() (*gorm.DB, error) {
 		if driver == "sqlite" && dsn != ":memory:" {
 			_ = os.MkdirAll(filepath.Dir(dsn), 0755)
 		}
+		if isPostgresDriver(driver) {
+			dbErr = ensurePostgresDatabase(dsn)
+			if dbErr != nil {
+				return
+			}
+		}
+		if driver == "mysql" {
+			dbErr = ensureMySQLDatabase(dsn)
+			if dbErr != nil {
+				return
+			}
+		}
 		db, dbErr = gorm.Open(dialector(driver, dsn), &gorm.Config{})
 		if dbErr != nil {
 			return
@@ -59,10 +77,103 @@ func DB() (*gorm.DB, error) {
 func dialector(driver string, dsn string) gorm.Dialector {
 	switch driver {
 	case "mysql":
-		return mysql.Open(dsn)
+		return gormmysql.Open(dsn)
 	case "postgres", "postgresql":
 		return postgres.Open(dsn)
 	default:
 		return sqlite.Open(dsn)
 	}
 }
+
+func isPostgresDriver(driver string) bool {
+	return driver == "postgres" || driver == "postgresql"
+}
+
+func ensureMySQLDatabase(dsn string) error {
+	cfg, err := mysqldriver.ParseDSN(dsn)
+	if err != nil {
+		return err
+	}
+	target := strings.TrimSpace(cfg.DBName)
+	if target == "" {
+		return nil
+	}
+	ctx := context.Background()
+	targetDB, err := sql.Open("mysql", dsn)
+	if err != nil {
+		return err
+	}
+	err = targetDB.PingContext(ctx)
+	_ = targetDB.Close()
+	if err == nil {
+		return nil
+	}
+	if !isMySQLError(err, 1049) {
+		return err
+	}
+
+	maintenance := cfg.Clone()
+	maintenance.DBName = ""
+	serverDB, err := sql.Open("mysql", maintenance.FormatDSN())
+	if err != nil {
+		return err
+	}
+	defer serverDB.Close()
+
+	_, err = serverDB.ExecContext(ctx, "CREATE DATABASE "+quoteMySQLIdentifier(target)+" CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci")
+	if isMySQLError(err, 1007) {
+		return nil
+	}
+	return err
+}
+
+func ensurePostgresDatabase(dsn string) error {
+	cfg, err := pgx.ParseConfig(dsn)
+	if err != nil {
+		return err
+	}
+	target := strings.TrimSpace(cfg.Database)
+	if target == "" {
+		return nil
+	}
+	ctx := context.Background()
+	conn, err := pgx.ConnectConfig(ctx, cfg)
+	if err == nil {
+		_ = conn.Close(ctx)
+		return nil
+	}
+	if !isPostgresError(err, "3D000") {
+		return err
+	}
+
+	maintenance := cfg.Copy()
+	maintenance.Database = "postgres"
+	if strings.EqualFold(target, "postgres") {
+		maintenance.Database = "template1"
+	}
+	conn, err = pgx.ConnectConfig(ctx, maintenance)
+	if err != nil {
+		return err
+	}
+	defer conn.Close(ctx)
+
+	_, err = conn.Exec(ctx, "CREATE DATABASE "+pgx.Identifier{target}.Sanitize(), pgx.QueryExecModeExec)
+	if isPostgresError(err, "42P04") {
+		return nil
+	}
+	return err
+}
+
+func isMySQLError(err error, number uint16) bool {
+	var mysqlErr *mysqldriver.MySQLError
+	return errors.As(err, &mysqlErr) && mysqlErr.Number == number
+}
+
+func isPostgresError(err error, code string) bool {
+	var pgErr *pgconn.PgError
+	return errors.As(err, &pgErr) && pgErr.Code == code
+}
+
+func quoteMySQLIdentifier(name string) string {
+	return "`" + strings.ReplaceAll(name, "`", "``") + "`"
+}