[CLAUDE] Phase5 prep: production infra + deploy scripts + 4 guides + FE refresh token

Backend production infra:
- Packages: Serilog.Sinks.File, HealthChecks.EntityFrameworkCore (RateLimiting built-in .NET 10)
- appsettings.Production.json MOI: placeholder __SET_VIA_SECRETS__, AllowedOrigins, Serilog File sink rolling daily retention 30d, RateLimit config
- appsettings.json + Development.json: them Serilog WriteTo Console
- Program.cs REWRITE:
  - Serilog ReadFrom.Configuration (prod file / dev console)
  - Rate limiter: policy auth-login 5/min/IP (AuthController.Login) + GlobalLimiter 300/min/IP
  - Health checks: /health/live liveness (empty predicate) + /health/ready DB probe (AddDbContextCheck)
  - HSTS production 1 year
  - CORS origins from config AllowedOrigins (default dev 2 localhost)
- AuthController.Login gắn [EnableRateLimiting("auth-login")]

Deploy scripts:
- scripts/deploy-iis.ps1: stop pool → backup current → clean+extract artifact → start pool → health check loop 30s timeout → rollback instruction if fail
- scripts/backup-sql.ps1: BACKUP DATABASE voi INIT+COMPRESSION+CHECKSUM + retention 30d auto cleanup
- .gitea/workflows/deploy.yml MOI: 4 job build BE (Windows) + build 2 FE (Ubuntu, pin .nvmrc 20) + deploy-iis qua WinRM PSSession (secrets IIS_HOST/USER/PASSWORD/JWT_SECRET/DB_CONNECTION)

Docs guides MOI (4 file):
- deployment-iis.md: prereqs (IIS features, Hosting Bundle, SQL, WinRM) + setup lan dau (app pool, 3 site, HTTPS win-acme, user-secrets) + deploy hang ngay (CI/CD + manual) + rollback + monitoring + troubleshooting + SPA web.config sample
- cicd.md: pipeline overview 4 job, secrets setup, runner Windows+Ubuntu, branch strategy, build optimizations, common CI/CD issues
- security-checklist.md: OWASP top 10 2021 mapping voi status + pre go-live checklist + incident response
- runbook.md: daily ops (health/logs), restart/rollback, DB backup/restore/migration revert, user management (reset password, unlock, disable), monitoring (CPU/disk/connection pool), deployment checklist, common gotcha

Frontend refresh token (ca 2 app fe-admin + fe-user):
- lib/api.ts REWRITE: them REFRESH_KEY, axios response interceptor 401 → POST /auth/refresh → retry request goc. Queue pattern cho nhieu request song song chi 1 refresh call chay. Skip retry /auth/login + /auth/refresh tranh infinite loop. _retry flag tren original config.
- contexts/AuthContext.tsx: luu+xoa REFRESH_KEY trong login/logout

E2E verified:
- GET /health/live → 200 Healthy
- GET /health/ready → 200 Healthy (DB probe)
- Rate limit flood 7 POST /auth/login → #1-5 HTTP 400 (cred sai) + #6-7 HTTP 429 Too Many Requests ✅
- TS check fe-admin + fe-user → pass
- dotnet build → 0 errors

Docs updates:
- docs/STATUS.md: Phase 5 prep done, next Phase 5 deploy production + Phase 5.1 security hardening, cumulative stats 8 commits
- docs/HANDOFF.md: phase table them Phase 5 prep row, file tree update voi guides + scripts + workflows, git state commit 8
- docs/changelog/migration-todos.md: tick Phase 5 prep items (12 items done) + Phase 5 deploy items remaining + Phase 5.1 security hardening list
- docs/changelog/sessions/2026-04-21-1530-phase5-prep.md: session log chi tiet

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Backend/SolutionErp.Api/appsettings.json

@@ -17,7 +17,14 @@
         "Microsoft.EntityFrameworkCore": "Warning",
         "System": "Warning"
       }
-    }
+    },
+    "WriteTo": [
+      { "Name": "Console" }
+    ]
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "RateLimit": {
+    "AuthLoginPerMinute": 5,
+    "GlobalPerMinute": 300
+  }
 }