docs: add .gitea/ISSUE_TEMPLATE/bug_report.md

.gitea/ISSUE_TEMPLATE/bug_report.md

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+# Bug Report
+
+## Summary
+
+Describe the problem and expected behavior.
+
+## Environment
+
+- Repo version/commit:
+- OS/toolchain/board/service:
+- Relevant configuration with secrets removed:
+
+## Reproduction
+
+1.
+2.
+3.
+
+## Logs
+
+Paste only sanitized logs. Remove credentials, tokens, personal data, captures, dumps, and target identifiers.