feat(web): add password setup page, change password, and settings tabs

- First-time visitors see a password setup page instead of open access
- Password persisted to SQLite (env var DBX_PASSWORD takes priority)
- Add change password in settings dialog (Security tab, web only)
- Split settings dialog into Editor and Security tabs
- Argon2 hashing for all password storage

src/i18n/locales/en.ts

@@ -2,6 +2,26 @@ export default {
   app: {
     name: "DBX",
   },
+  auth: {
+    setupTitle: "Set up access password",
+    setupDescription: "Set a password to protect your instance",
+    loginDescription: "Database management tool",
+    newPassword: "Enter new password",
+    confirmPassword: "Confirm password",
+    enterPassword: "Enter access password",
+    passwordMismatch: "Passwords do not match",
+    setPassword: "Set Password",
+    login: "Login",
+    processing: "Processing...",
+    loginFailed: "Incorrect password",
+    connectFailed: "Connection failed",
+    changePassword: "Change Password",
+    oldPassword: "Current password",
+    oldPasswordWrong: "Current password is incorrect",
+    passwordChanged: "Password changed successfully",
+    changePasswordFailed: "Failed to change password",
+    changePasswordDescription: "Enter your current password and choose a new one",
+  },
   toolbar: {
     newConnection: "New Connection",
     newQuery: "New Query",
@@ -625,6 +645,8 @@ export default {
   },
   settings: {
     title: "Settings",
+    editorTab: "Editor",
+    securityTab: "Security",
     fontFamily: "Font Family",
     selectFont: "Select font...",
     fontSize: "Font Size",

src/i18n/locales/zh-CN.ts

@@ -2,6 +2,26 @@ export default {
   app: {
     name: "DBX",
   },
+  auth: {
+    setupTitle: "设置访问密码",
+    setupDescription: "设置密码以保护您的实例",
+    loginDescription: "数据库管理工具",
+    newPassword: "输入新密码",
+    confirmPassword: "确认密码",
+    enterPassword: "请输入访问密码",
+    passwordMismatch: "两次输入的密码不一致",
+    setPassword: "设置密码",
+    login: "登录",
+    processing: "处理中...",
+    loginFailed: "密码错误",
+    connectFailed: "连接失败",
+    changePassword: "修改密码",
+    oldPassword: "当前密码",
+    oldPasswordWrong: "当前密码不正确",
+    passwordChanged: "密码修改成功",
+    changePasswordFailed: "密码修改失败",
+    changePasswordDescription: "输入当前密码并设置新密码",
+  },
   toolbar: {
     newConnection: "新建连接",
     newQuery: "新建查询",
@@ -617,6 +637,8 @@ export default {
   },
   settings: {
     title: "设置",
+    editorTab: "编辑器",
+    securityTab: "安全",
     fontFamily: "字体",
     selectFont: "选择字体...",
     fontSize: "字号",