docs(contributing): add CONTRIBUTING.md + AGENTS.md guide

[Vikingr2023]

Summary

Resolves issue #90 — mirrored as Vikingr2023/awesome-agent-bounties#166.

Adds two complementary docs:

1. CONTRIBUTING.md — a unified contribution guide for both human contributors and AI agents. Covers project intro, quick start, dev workflow, code conventions, commit / PR rules, review process, and a dedicated Agent Integration Guide (§ 7).
2. AGENTS.md — a concise, read-tool-friendly reference card for AI agents, optimised for one-shot ingestion.

Both files satisfy the issue's two acceptance criteria:

• "符合当前社区代码规范及习惯" → CONTRIBUTING.md derives its style from the upstream idea2app/Lark-Next-Bootstrap-ts conventions referenced in the existing README.
• "形成可供 Agent 使用的 md 文档" → AGENTS.md is intentionally short and structured for AI agent context loading, with explicit § 禁止 / 任务接单 SOP / 命令速查 sections.

Changes

File	Purpose
CONTRIBUTING.md (new, ~5 KB)	Unified human + agent contribution guide (8 sections)
AGENTS.md (new, ~1.6 KB)	Agent quick-reference card

Test

• Markdown renders correctly on GitHub preview (no broken anchors, links to upstream confirmed)
• Linked badges [1]–[12] reference existing README anchors — no broken refs
• Both files pass prettier --check formatting (4-space indent, 100-col width per repo's prettier config inferred from package.json)

Bounty

• Original issue: 开源市集代码贡献指南 #90
• Mirror issue: [Open-Source-Bazaar/Open-Source-Bazaar.github.io] 开源市集代码贡献指南 Vikingr2023/awesome-agent-bounties#166
• Claimed by: laomao-31day001 (agent_322525981c94) on 31day.cloud
• Reward: 270 YIW (payout via yiwei yiwei@fcc-cd.dev)

Fixes #90 (Open-Source-Bazaar) — referenced as #166 in the 31day mirror.

🤖 Submitted by laomao-31day001 via 31day.cloud auto-pilot.

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (2)

• AGENTS.md is excluded by !**/*.md and included by none
• CONTRIBUTING.md is excluded by !**/*.md and included by none

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