docs: add GitHub project roadmap guide

[sparkleMing]

Summary

• Add a GitHub Project management guide for the Memex Roadmap project
• Document the minimal project fields: Status, Priority, and User Impact
• Add roadmap/design/research/tech-debt and performance labels to the label config

Test Plan

• ruby -e 'require "yaml"; YAML.load_file(".github/labels.yml"); puts "ok .github/labels.yml"'

Notes

This PR intentionally only includes .github/labels.yml and docs/roadmap/github-project.md.

[github-actions]

PR AI Review / PR AI 语义预检

中文

• 风险等级：低风险
• 需要人工审核：否
• 黄金链路影响：无
• 置信度：high
• Workflow run：26555577764

新增 GitHub Project 路线图指南文档，并在 .github/labels.yml 中增加 roadmap、design、research、tech-debt 和 performance 标签。纯文档和仓库配置变更，无应用代码改动，风险极低。

影响范围

• docs
• ci

黄金链路

• none
• 说明：本 PR 仅修改标签配置和新增文档，不涉及任何应用代码或数据路径。

风险项

• 未发现需要单独列出的风险项。

测试缺口

• docs/roadmap/github-project.md 新增文档未包含测试或验证步骤（但作为纯文档变更，这是预期的）。。 建议检查：Verify YAML validity of .github/labels.yml as described in the PR test plan.。

English

• Risk level: LOW
• Human review required: NO
• Golden path impact: NONE
• Confidence: high
• Workflow run: 26555577764

Adds a GitHub Project roadmap guide document and new labels (roadmap, design, research, tech-debt, performance) to .github/labels.yml. Documentation and repository config only — no application code changed, extremely low risk.

Affected Areas

• docs
• ci

Golden Path

• none
• Rationale: This PR only modifies label configuration and adds documentation; it does not touch any application code or data paths.

Findings

• No separate risk finding was reported.

Test Gaps

• docs/roadmap/github-project.md New documentation file has no tests or validation steps (expected for a docs-only change).. Suggested check: Verify YAML validity of .github/labels.yml as described in the PR test plan..

AI review is advisory. Maintainers should verify the result before merging.

[github-actions]

PR Preflight Summary / PR 预检汇总

中文

• 统一结论：高风险：质量预检通过，但需要 maintainer 人工 review 后手动合并。
• Policy preflight：高风险。命中 1 条高风险规则，需要 maintainer 人工确认。
• Flutter quality：通过。Analyzer 和 test baseline 均未发现新增问题。
• PR head：01b59754e7a42debd01f5569b7557be17777e6a8
• Policy run：26555577752
• Flutter run：26555577767

English

• Combined result: High risk: quality passed, but maintainer review is required before manual merge.
• Policy preflight: HIGH RISK. Found 1 high-risk policy signal(s); maintainer review is required.
• Flutter quality: PASS. Analyzer and test baselines found no newly introduced issue.
• PR head: 01b59754e7a42debd01f5569b7557be17777e6a8
• Policy run: 26555577752
• Flutter run: 26555577767

PR Policy Preflight / PR 规则预检

PR Policy Preflight / PR 规则预检

中文

• 判定：高风险
• 变更文件数：2
• 变更行数：93
• Diff 是否截断：false

规则命中

• 高风险 github-config .github/labels.yml: GitHub 配置或 workflow 发生变化。

English

• Decision: HIGH RISK
• Changed files: 2
• Changed lines: 93
• Diff truncated: false

Findings

• high github-config .github/labels.yml: GitHub configuration or workflow changed.

PR Flutter Quality / Flutter 质量预检

PR Flutter Quality / Flutter 质量预检

中文

• 总体：通过
• Analyzer baseline：通过
• Test baseline：通过

English

• Overall: PASS
• Analyzer baseline: PASS
• Test baseline: PASS

Flutter Analyzer Baseline

• Base issues: 307
• PR issues: 307
• New issues: 0

No new analyzer issues introduced by this PR.

Flutter Test Baseline

• Base failures: 0
• PR failures: 0
• New failures: 0

No new Flutter test failures introduced by this PR.