[CLAUDE] Infra Api: Chunk T — Disable auto re-seed demo data qua DemoSeed:Disabled flag (appsettings)

Bro UAT post-Plan R+S phát hiện: 4 phiếu [DEMO]-A/B + 2 V1 workflows + 1
V2 sample TỰ ĐỘNG RE-SEED sau BE deploy commits Plan P+Q+R+S → IIS recycle
→ DbInitializer.InitializeAsync auto-seed lại 5 demo seed methods.

Plan T fix root cause: Config flag `DemoSeed:Disabled` trong
appsettings.json (production default true) → DbInitializer check flag →
skip 5 demo seed methods.

Note: appsettings.Production.json bị .gitignore (chứa secrets prod), nên
em set flag mặc định trong appsettings.json (commit qua git) — production
inherit true. Dev override false trong appsettings.Development.json để
test fresh demo seed local.

Methods SKIP khi DemoSeed:Disabled=true:
1. SeedWorkflowDefinitionsAsync (V1 PE workflow QT-DN-A v1 + QT-DN-B v1)
2. SeedPurchaseEvaluationWorkflowsAsync (V1 PE workflow extended)
3. SeedDemoContractsAsync ([DEMO] HĐ 7-type sample)
4. SeedDemoPurchaseEvaluationsAsync ([DEMO] PE 4 sample with V1 pin)
5. SeedSampleApprovalWorkflowsV2Async (V2 sample mẫu UAT type B)

Methods KEEP (luôn chạy):
- SeedRoles + SeedAdmin + SeedDepartments + SeedDemoUsers (30 UAT users)
- SeedMenuTree + SeedAdminPermissions + SeedDemoMasterData (Supplier/Project)
- SeedContractTemplates + SeedCatalogs + BackfillContractCodes
- BackfillUserEmailDomain (Phase 6 rebrand migration helper)

Files changed:
- src/Backend/SolutionErp.Infrastructure/Persistence/DbInitializer.cs:
  + using Microsoft.Extensions.Configuration
  + Read DemoSeed:Disabled flag từ IConfiguration
  + Log "DemoSeed:Disabled=true — skip ..." khi flag true
  + Wrap 5 method seed conditional `if (!demoSeedDisabled) { ... }`

- src/Backend/SolutionErp.Api/appsettings.json:
  + "DemoSeed": { "Disabled": true } + comment narrative

- src/Backend/SolutionErp.Api/appsettings.Development.json:
  + "DemoSeed": { "Disabled": false } override cho dev

Workflow expected sau deploy:
1. CI deploy commit T → IIS recycle app pool
2. BE startup → DbInitializer reads DemoSeed:Disabled=true
3. Skip 5 demo seed methods → DB state preserved
4. Bro UAT clean slate hoàn toàn — Designer setup workflow mới from scratch

Pending T5: Final DELETE current state (4 PE + 2 V1 + 1 V2 mẫu UAT) sau
deploy applied flag. T6 verify no re-seed loop sau re-deploy.

Verify:
- dotnet build SolutionErp.slnx clean (0 err, 2 warn pre-existing)
- dotnet test SolutionErp.slnx **111/111 PASS** unchanged

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

src/Backend/SolutionErp.Api/appsettings.Development.json

@@ -17,5 +17,9 @@
     "WriteTo": [
       { "Name": "Console" }
     ]
+  },
+  "DemoSeed": {
+    "_Comment": "Plan T S23 t10 — Dev override: false để test demo seed local. Production appsettings.json mặc định true (skip).",
+    "Disabled": false
   }
 }

src/Backend/SolutionErp.Api/appsettings.json

@@ -29,5 +29,9 @@
   },
   "Uploads": {
     "RootPath": "uploads"
+  },
+  "DemoSeed": {
+    "_Comment": "Plan T S23 t10 (2026-05-15) — DbInitializer skip auto re-seed Demo workflows + PE + Contracts khi true. Production UAT clean slate sau Plan R+S. Dev override false trong appsettings.Development.json để test fresh seed local.",
+    "Disabled": true
   }
 }