chore: prepare project for open source release

- Remove internal planning docs (CLAUDE.md, docs/, feature.md, livePlan.md) from git tracking
- Add .gitignore rules to prevent re-tracking internal files
- Add README.md (Chinese) and README.en.md (English) with screenshots, features, quick start
- Add LICENSE (MIT)
- Add CONTRIBUTING.md with dev setup, commit conventions, PR guide
- Add CHANGELOG.md for v1.0.0
- Add .github/ issue templates (bug report, feature request) and PR template
- Add public/ screenshots (p1-p6)

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,41 @@
+name: 功能建议
+description: 建议一个新功能或改进
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        感谢你的建议！在提交前请先搜索现有 Issue，避免重复。
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: 需求背景
+      placeholder: 这个功能解决了什么问题？目前的痛点是什么？
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: 建议方案
+      placeholder: 你期望的功能是怎样的？
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: 替代方案
+      placeholder: 你是否考虑过其他方案？
+
+  - type: dropdown
+    id: contribute
+    attributes:
+      label: 是否愿意提交 PR？
+      options:
+        - 是，我愿意实现这个功能
+        - 否，希望维护者实现
+        - 不确定
+    validations:
+      required: true