[CLAUDE] Config: appsettings.Production.json.example voi domain huypham.vn + policy 12-char

- Template commit (not actual Production.json — bi gitignore de tranh leak secret)
- ConnectionStrings: User Id=vrapp, Password placeholder
- AllowedOrigins: https://admin.huypham.vn + https://user.huypham.vn
- Identity.Password.RequiredLength = 12 prod (dev still 8)
- Identity.Lockout: 15min, 5 fail max
- Khi deploy: cp appsettings.Production.json.example appsettings.Production.json tren server va set secret thuc te (Jwt.Secret, ConnectionStrings.Default password)

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

src/Backend/SolutionErp.Api/appsettings.Production.json.example

@@ -0,0 +1,54 @@
+{
+  "ConnectionStrings": {
+    "Default": "Server=localhost;Database=SolutionErp;User Id=vrapp;Password=__SET_VIA_SECRETS__;MultipleActiveResultSets=true;TrustServerCertificate=true;Encrypt=true"
+  },
+  "Jwt": {
+    "Issuer": "SolutionErp.Api",
+    "Audience": "SolutionErp.Client",
+    "Secret": "__SET_VIA_USER_SECRETS_OR_ENV__minimum_64_chars_random",
+    "AccessTokenExpiryMinutes": 60,
+    "RefreshTokenExpiryDays": 7
+  },
+  "AllowedOrigins": [
+    "https://admin.huypham.vn",
+    "https://user.huypham.vn"
+  ],
+  "Identity": {
+    "Password": {
+      "RequiredLength": 12
+    },
+    "Lockout": {
+      "Minutes": 15,
+      "MaxFailedAttempts": 5
+    }
+  },
+  "Serilog": {
+    "MinimumLevel": {
+      "Default": "Information",
+      "Override": {
+        "Microsoft": "Warning",
+        "Microsoft.EntityFrameworkCore": "Warning",
+        "Microsoft.AspNetCore.Hosting.Diagnostics": "Warning",
+        "System": "Warning"
+      }
+    },
+    "WriteTo": [
+      { "Name": "Console" },
+      {
+        "Name": "File",
+        "Args": {
+          "path": "logs/solution-erp-.log",
+          "rollingInterval": "Day",
+          "retainedFileCountLimit": 30,
+          "fileSizeLimitBytes": 104857600,
+          "rollOnFileSizeLimit": true
+        }
+      }
+    ]
+  },
+  "AllowedHosts": "*",
+  "RateLimit": {
+    "AuthLoginPerMinute": 5,
+    "GlobalPerMinute": 300
+  }
+}