Repo hygiene: fix .gitignore, normalize line endings, correct repo paths

- Replace misspelled/ineffective ignore file with a real .gitignore:
  deploy/ (contains SSH private key), *.pem, .env*, and Python/Django/
  Wagtail runtime artifacts are now excluded from version control
- Add .gitattributes (* text=auto eol=lf) to stop CRLF/LF churn that
  made all 26 tracked files show spurious full-file diffs
- Correct repo root path /mnt/d/OPC/skelet -> /mnt/d/opc_project/skelet
  in AGENTS.md, 00-ai-start-here, 03-tech-stack, 90-harness-reference,
  current-state (progress.md history left as-is, append-only)
- Update current-state.md snapshot and append maintenance record to
  progress.md per harness rules

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

AGENTS.md

@@ -16,7 +16,7 @@ Skelet 是一个介绍、分类、评测开源项目骨架的网站。目标用
 
 ## 开发环境
 
-- 标准开发环境是 WSL2 / Linux，仓库根目录为 `/mnt/d/OPC/skelet`。
+- 标准开发环境是 WSL2 / Linux，仓库根目录为 `/mnt/d/opc_project/skelet`。
 - 所有文档命令统一使用 bash 形态。
 - `init.sh` 是标准启动与验证入口；`init.ps1` 仅作为 Windows 下的可选辅助，允许滞后。