Add repository standards: CODE_OF_CONDUCT, SECURITY policy, .editorconfig, and issue templates

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{yml,yaml,json,md,js,css}]
+indent_size = 2

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: "🐛 Bug Report / 问题与错误反馈"
+description: "Report a bug or layout error in the Java guide website or textbook scripts"
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please fill out this form to report a bug. / 请填写此表单报告排版或代码执行错误。
+  - type: textarea
+    id: description
+    attributes:
+      label: "Bug Description / 问题描述"
+      description: "A clear description of what the issue is."
+      placeholder: "e.g., Code block fails on chapter X due to Spring Boot version update..."
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: "Reproduction Steps / 复现步骤"
+      description: "How can we reproduce the error?"
+      placeholder: |
+        1. Open chapter...
+        2. Run code block...
+        3. See error...
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: "🚀 Suggestion / 功能或内容建议"
+description: "Suggest a new topic, section, or website enhancement"
+title: "[Suggestion]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Suggest recommendations for the Java progression guide. / 欢迎为本 Java 进阶之路指南提出改进建议。
+  - type: textarea
+    id: details
+    attributes:
+      label: "Details / 建议详情"
+      description: "What Java features, frameworks, or site pages should be added?"
+      placeholder: "Suggest adding microservice deployment section..."
+    validations:
+      required: true

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, caste, color, religion, or sexual
+identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best for the overall community, not just for us as
+  individuals
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and unwelcome sexual attention or
+  advances
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+
+## Reporting & Contact
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the repository owners. All complaints will be reviewed and investigated
+promptly and fairly.

SECURITY.md

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+# Security Policy / 安全策略
+
+## Supported Versions / 支持的版本
+
+Only the latest stable release build on the `master` branch is supported with security updates.
+
+## Reporting a Vulnerability / 漏洞汇报
+
+If you identify a security vulnerability in our build scripts, parser pipelines, or code examples, please do **not** open a public issue.
+
+Please report vulnerabilities privately by emailing the repository owner or using GitHub's private vulnerability reporting feature.
+
+如果您在我们的构建脚本、解析管道或示例代码中发现安全漏洞，请勿通过公开 Issue 报告，请使用 GitHub 的私有漏洞报告功能或直接发送电子邮件联系维护者。