fix: persist docker sqlite settings path

.env.example

@@ -19,6 +19,7 @@ PORT=8080
 # 数据库配置，默认使用本地 SQLite。
 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: DATABASE_DSN=user:password@tcp(127.0.0.1:3306)/infinite_canvas?parseTime=true
 # postgres: DATABASE_DSN=postgres://user:password@127.0.0.1:5432/infinite_canvas?sslmode=disable
 DATABASE_DSN=data/infinite-canvas.db

config/config.go

@@ -3,6 +3,8 @@ package config
 import (
 	"crypto/rand"
 	"encoding/base64"
+	"os"
+	"path/filepath"
 	"strings"
 
 	"github.com/caarlos0/env/v11"
@@ -30,6 +32,7 @@ func Load() error {
 	if err := env.Parse(&Cfg); err != nil {
 		return err
 	}
+	normalizeDockerSQLiteDSN("/app/data")
 	if strings.TrimSpace(Cfg.JWTSecret) == "" || Cfg.JWTSecret == "infinite-canvas" {
 		secret, err := randomSecret()
 		if err != nil {
@@ -40,6 +43,33 @@ func Load() error {
 	return nil
 }
 
+func normalizeDockerSQLiteDSN(appDataDir string) {
+	driver := strings.ToLower(strings.TrimSpace(Cfg.StorageDriver))
+	if driver != "" && driver != "sqlite" {
+		return
+	}
+	dsn := strings.TrimSpace(Cfg.DatabaseDSN)
+	if dsn == "" || dsn == ":memory:" || strings.HasPrefix(dsn, "file:") {
+		return
+	}
+	pathPart, suffix := dsn, ""
+	if index := strings.Index(dsn, "?"); index >= 0 {
+		pathPart = dsn[:index]
+		suffix = dsn[index:]
+	}
+	if filepath.IsAbs(pathPart) {
+		return
+	}
+	slashPath := filepath.ToSlash(pathPart)
+	if slashPath != "data" && !strings.HasPrefix(slashPath, "data/") {
+		return
+	}
+	if _, err := os.Stat(appDataDir); err != nil {
+		return
+	}
+	Cfg.DatabaseDSN = filepath.Join(filepath.Dir(appDataDir), filepath.FromSlash(slashPath)) + suffix
+}
+
 func randomSecret() (string, error) {
 	buf := make([]byte, 32)
 	if _, err := rand.Read(buf); err != nil {

config/config_test.go

@@ -0,0 +1,33 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestNormalizeDockerSQLiteDSNUsesMountedDataDir(t *testing.T) {
+	root := t.TempDir()
+	appDataDir := filepath.Join(root, "data")
+	if err := os.MkdirAll(appDataDir, 0755); err != nil {
+		t.Fatal(err)
+	}
+	Cfg = Config{StorageDriver: "sqlite", DatabaseDSN: "data/infinite-canvas.db?_pragma=busy_timeout(5000)"}
+
+	normalizeDockerSQLiteDSN(appDataDir)
+
+	want := filepath.Join(root, "data", "infinite-canvas.db") + "?_pragma=busy_timeout(5000)"
+	if Cfg.DatabaseDSN != want {
+		t.Fatalf("DatabaseDSN = %q, want %q", Cfg.DatabaseDSN, want)
+	}
+}
+
+func TestNormalizeDockerSQLiteDSNLeavesLocalPathWithoutMountedDataDir(t *testing.T) {
+	Cfg = Config{StorageDriver: "sqlite", DatabaseDSN: "data/infinite-canvas.db"}
+
+	normalizeDockerSQLiteDSN(filepath.Join(t.TempDir(), "missing-data"))
+
+	if Cfg.DatabaseDSN != "data/infinite-canvas.db" {
+		t.Fatalf("DatabaseDSN = %q, want relative local path", Cfg.DatabaseDSN)
+	}
+}

docs/pending-test.md

@@ -1,5 +1,6 @@
 # 待测试
 
+- Docker 部署时，`DATABASE_DSN=data/infinite-canvas.db` 会在存在 `/app/data` 挂载目录时自动归一到 `/app/data/infinite-canvas.db`，需要验证后台模型配置不会再因为工作目录变为 `/app/web` 而读到空库。
 - Seedance 参考素材失败原因排查：后端会把火山上游错误摘要返回给前端；`/video` 和画布视频生成会按 `图片1/视频1/音频1` 自动编号参考素材，并在实际请求提示词中注入编号说明；参考视频会在请求前校验大小、时长、宽高、宽高比和像素总量。
 - 画布项目导出改为下载 `.zip` 压缩包，包内包含 `projects.json` 和当前画布引用到的本地图片、视频文件，避免只导出 JSON 时丢失媒体内容。
 - 画布库支持多选后一键导出多个画布项目，导出的压缩包可一次恢复多个项目。