feat(platform): 开源发布 - 初始化 Open AI Canvas

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 缺陷报告
+description: 报告可以稳定复现的问题
+title: "[Bug] "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: 安全漏洞请按 SECURITY.md 私下报告，不要创建公开 Issue。
+  - type: input
+    id: version
+    attributes:
+      label: 版本或提交
+      placeholder: v0.12.0 / commit SHA
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: 复现步骤
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: 预期与实际结果
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: 环境信息
+      description: 浏览器、操作系统、部署方式；请移除密钥和敏感日志。

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 私密安全报告
+    url: https://github.com/ddcat666/open-ai-canvas/security/advisories/new
+    about: 请勿在公开 Issue 中披露未修复漏洞

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: 功能建议
+description: 提议一个明确的使用场景或改进
+title: "[Feature] "
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: 要解决的问题
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: 建议方案
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: 可选方案与影响