refactor(hub): 拆分 agent_team 仓储并下沉 SafeGo，清偿 lint 欠账

[DeliciousBuding]

Summary

hub-server 三块低风险结构拆解（探查报告中 hub Top 4/8 项），零行为变化：

1. repository/agent_team.go 564 行 → 7 个聚合文件：agent_team_teams/runs/assignments/tasks/artifacts/events/usage.go。纯文件切分，声明级脚本迁移 + 49/49 对账，无丢失无重复。
2. middleware.SafeGo 下沉 internal/safego 叶子包：解除 service 层（agent_dispatch）对 HTTP 中间件包的依赖——internal/service/ 现已完全不再 import middleware（探查报告中的分层违规 Top 8）。补 2 个 panic 恢复冒烟测试（此前无直接覆盖）。
3. lint 欠账清偿：ratchet 本地由 fail 转 PASS（43 findings 全部 baseline 注册）：
   • 修复 5 处 QF1008（Dialector 嵌入选择器）：usage/audit/agent/message×2。其中 audit/message 是拆分降低同文本 finding 数后从 max-same-issues 封顶下浮出的存量 findings（master 上被 agent_team.go 的同类 findings 遮蔽）
   • 重命名 client_auth_test.go 夹具常量 tokenHash → blacklistKey，消除 3 处 G101 误报（master 上 ratchet 已红，本 PR 顺带还清）

Test plan

• go build / go vet / staticcheck 全绿
• go test ./... -count=1 -short -race -coverprofile 通过（CI 同款）
• 门禁：verify-hub-layering / verify-hub-pure-packages / verify-outbound-client-hygiene / verify-dto-contract / verify-openapi-contract / verify-config-domain-ssot / verify-hub-lint-ratchet 全部 PASS
• 声明级对账脚本：49/49 无丢失、无重复、无注释块错位

后续队列

• service/agent_dispatch.go 8 文件散装 → dispatchsvc 包收敛（hub Top 1）
• app/events.go pending 重放下沉（hub Top 2）
• ws 类型上渗治理（hub Top 3）

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📥 Commits

Reviewing files that changed from the base of the PR and between b49c40c and 24b5de3.

📒 Files selected for processing (16)

• hub-server/internal/cache/client_auth_test.go
• hub-server/internal/handler/ws.go
• hub-server/internal/repository/agent.go
• hub-server/internal/repository/agent_team.go
• hub-server/internal/repository/agent_team_artifacts.go
• hub-server/internal/repository/agent_team_assignments.go
• hub-server/internal/repository/agent_team_events.go
• hub-server/internal/repository/agent_team_runs.go
• hub-server/internal/repository/agent_team_tasks.go
• hub-server/internal/repository/agent_team_teams.go
• hub-server/internal/repository/agent_team_usage.go
• hub-server/internal/repository/audit.go
• hub-server/internal/repository/message.go
• hub-server/internal/safego/safego.go
• hub-server/internal/safego/safego_test.go
• hub-server/internal/service/agent_dispatch.go

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