优化目录结构

backend/src/main/resources/application.properties

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+# for mysql
+logging.level.root=${LOG_LEVEL:INFO}
+logging.level.com.openisle.service.CosImageUploader=DEBUG
+spring.datasource.url=${MYSQL_URL:jdbc:mysql://localhost:3306/openisle}
+spring.datasource.username=${MYSQL_USER:root}
+spring.datasource.password=${MYSQL_PASSWORD:password}
+spring.jpa.hibernate.ddl-auto=update
+
+# for jwt
+app.jwt.secret=${JWT_SECRET:jwt_sec}
+app.jwt.reason-secret=${JWT_REASON_SECRET:jwt_reason_sec}
+app.jwt.reset-secret=${JWT_RESET_SECRET:jwt_reset_sec}
+app.jwt.expiration=${JWT_EXPIRATION:86400000}
+# Password strength: LOW, MEDIUM or HIGH
+app.password.strength=${PASSWORD_STRENGTH:LOW}
+
+# Post publish mode: DIRECT or REVIEW
+app.post.publish-mode=${POST_PUBLISH_MODE:DIRECT}
+
+# User register mode: DIRECT or WHITELIST
+app.register.mode=${REGISTER_MODE:WHITELIST}
+
+# Image upload configuration
+app.upload.check-type=${UPLOAD_CHECK_TYPE:true}
+app.upload.max-size=${UPLOAD_MAX_SIZE:5242880}
+
+# Default avatar generator configuration
+app.avatar.style=${AVATAR_STYLE:pixel-art-neutral}
+app.avatar.size=${AVATAR_SIZE:128}
+app.avatar.base-url=${AVATAR_BASE_URL:https://api.dicebear.com/6.x}
+
+# Default list size for user posts and replies
+app.user.posts-limit=${USER_POSTS_LIMIT:10}
+app.user.replies-limit=${USER_REPLIES_LIMIT:50}
+# Length of extracted snippets for posts and search (-1 to disable truncation)
+app.snippet-length=${SNIPPET_LENGTH:50}
+
+# Captcha configuration
+app.captcha.enabled=${CAPTCHA_ENABLED:false}
+recaptcha.secret-key=${RECAPTCHA_SECRET_KEY:}
+app.captcha.register-enabled=${CAPTCHA_REGISTER_ENABLED:false}
+app.captcha.login-enabled=${CAPTCHA_LOGIN_ENABLED:false}
+app.captcha.post-enabled=${CAPTCHA_POST_ENABLED:false}
+app.captcha.comment-enabled=${CAPTCHA_COMMENT_ENABLED:false}
+
+# ========= Optional =========
+# for resend email send service, you can improve your service by yourself
+resend.api.key=${RESEND_API_KEY:}
+# your email services: ...
+
+# for tencent cloud image upload service, you can improve your service by yourself
+cos.base-url=${:https://example.com}
+cos.secret-id=${COS_SECRET_ID:}
+cos.secret-key=${COS_SECRET_KEY:}
+cos.region=${COS_REGION:ap-guangzhou}
+cos.bucket-name=${COS_BUCKET_NAME:}
+# your image upload services: ...
+
+# Google OAuth configuration
+google.client-id=${GOOGLE_CLIENT_ID:}
+# GitHub OAuth configuration
+github.client-id=${GITHUB_CLIENT_ID:}
+github.client-secret=${GITHUB_CLIENT_SECRET:}
+# Discord OAuth configuration
+discord.client-id=${DISCORD_CLIENT_ID:}
+discord.client-secret=${DISCORD_CLIENT_SECRET:}
+# Twitter OAuth configuration
+twitter.client-id=${TWITTER_CLIENT_ID:}
+twitter.client-secret=${TWITTER_CLIENT_SECRET:}
+# OpenAI configuration
+openai.api-key=${OPENAI_API_KEY:}
+openai.model=${OPENAI_MODEL:gpt-4o}
+# AI markdown format usage limit per user per day (-1 for unlimited)
+app.ai.format-limit=${AI_FORMAT_LIMIT:3}
+
+# Website URL for emails and redirects
+app.website-url=${WEBSITE_URL:https://www.open-isle.com}
+
+# Web push configuration
+app.webpush.public-key=${WEBPUSH_PUBLIC_KEY:}
+app.webpush.private-key=${WEBPUSH_PRIVATE_KEY:}