feat(auth): add user profile and password changing

[qwqcode]

closes #922

related to #942 #840 #279

This PR includes the following:

• Added user profile and password change dialog interfaces to the artalk-auth-plugin.
• Added a POST /user/profile HTTP API, allowing logged-in users to edit their profiles, including username, email, and website (also known as a link).
  • The API includes validation checks for the fields.
  • When the username is changed, the system checks if a user with the same combination of email and username already exists; if so, an error is returned.
  • When the email is changed, the system checks if the new email is already in use; if so, an error is returned.
  • Changing the email requires an additional code parameter for verifying the new email (which must be obtained by first calling POST /auth/email/send to send a verification code to the email).
• The password change feature reuses the POST /auth/email/register API, which includes the functionality for password change (also known as password reset or forgotten password).
  • If the combination of username and email exists, the user's password will be updated; otherwise, a new user will be registered.
  • Before calling this API and changing the user's email, you must first call POST /auth/email/send to send a verification code to the email.

---

zh-CN

• 给 artalk-auth-plugin 增加 个人资料和密码修改对话框界面
• 增加 POST /user/profile 的 HTTP API，允许已登录的用户对个人资料进行编辑，包括 用户名、邮箱、链接（又名website）。
  • 该接口包含字段合法性检测
  • 当用户的名称发生改变时会检查是否存在 邮箱和名称 组合相同的用户，如果存在则返回错误
  • 当用户邮箱发生改变时会检查是否使用了已存在的邮箱，如果存在则返回错误
  • 修改邮箱需要额外传递 code 参数，用于验证修改后的邮箱（需预先调用 POST /auth/email/send 向邮箱发送验证码）
• 密码修改功能复用了 POST /auth/email/register 接口，该接口包含用户密码修改功能（又称密码重置、忘记密码）
  • 当用户名和邮箱组合存在时，会修改该用户的密码，反之注册新用户
  • 调用该接口前和修改用户邮箱一样，需预先调用 POST /auth/email/send 向邮箱发送验证码

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 48 lines in your changes missing coverage. Please review.

Project coverage is 31.33%. Comparing base (5dc2752) to head (1331b9a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
server/handler/user_info_update.go	0.00%	47 Missing ⚠️
server/server.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #966      +/-   ##
==========================================
- Coverage   31.47%   31.33%   -0.14%     
==========================================
  Files         204      205       +1     
  Lines        8728     8776      +48     
==========================================
+ Hits         2747     2750       +3     
- Misses       5827     5872      +45     
  Partials      154      154              

Flag	Coverage Δ
go	31.33% <0.00%> (-0.14%)	⬇️

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