Rename public brand to VPSMaster, retain compatibility and document Beta roadmap

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report / 问题报告
+about: Report a reproducible VPSMaster issue without sensitive data
+title: "[Bug] "
+labels: bug
+---
+
+## Version and environment / 版本与环境
+
+- VPSMaster version and ZIP SHA256:
+- OS / Python / architecture:
+- Command (remove IPs, tokens and private paths):
+
+## Expected and actual / 预期与实际
+
+## Steps and redacted evidence / 复现步骤与脱敏证据
+
+Do not attach passwords, keys, subscriptions, raw journals or full system inventories.
+Unknown/provider-limited results are not automatically bugs. For sensitive vulnerabilities use the private route in SECURITY.md.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request / 功能建议
+about: Explain a VPSMaster use case and its safety boundaries
+title: "[Feature] "
+labels: enhancement
+---
+
+## User problem / 用户问题
+
+## Suggested behavior / 建议行为
+
+## Sources, privacy, resource budget and rollback / 来源、隐私、资源预算与回滚
+
+Check the Planned roadmap first. Do not include credentials or private reports.