infra: add PostgreSQL daily backup via pg_dump with rotation

- Add db-backup service to compose.yaml (postgres:17-alpine + cron)
- Add pgbackups volume for backup storage
- Add scripts/restore.sh for manual restore from latest backup
- Update .env.example with BACKUP_RETENTION_DAYS and BACKUP_VOLUME_NAME
- Document backup/restore flow in README

Bump version -> 1.15.0

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/GmRelay.AppHost/packages.lock.json

@@ -83,6 +83,12 @@
           "System.IO.Hashing": "10.0.3"
         }
       },
+      "SecurityCodeScan.VS2019": {
+        "type": "Direct",
+        "requested": "[5.6.7, )",
+        "resolved": "5.6.7",
+        "contentHash": "WIE9RJswdSc2j+rLz2gW6U+gMUjMHzY2j7C/CL8/R2olXNM/+twarfMnWqm+rZodDBvaYDApJyxM8mVYf9FGrQ=="
+      },
       "Aspire.Hosting": {
         "type": "Transitive",
         "resolved": "13.2.1",

src/GmRelay.Bot/packages.lock.json

@@ -95,6 +95,12 @@
           "Microsoft.Extensions.Logging.Abstractions": "10.0.0"
         }
       },
+      "SecurityCodeScan.VS2019": {
+        "type": "Direct",
+        "requested": "[5.6.7, )",
+        "resolved": "5.6.7",
+        "contentHash": "WIE9RJswdSc2j+rLz2gW6U+gMUjMHzY2j7C/CL8/R2olXNM/+twarfMnWqm+rZodDBvaYDApJyxM8mVYf9FGrQ=="
+      },
       "Telegram.Bot": {
         "type": "Direct",
         "requested": "[22.9.5.3, )",

src/GmRelay.ServiceDefaults/packages.lock.json

@@ -66,6 +66,12 @@
           "OpenTelemetry.Api": "[1.15.3, 2.0.0)"
         }
       },
+      "SecurityCodeScan.VS2019": {
+        "type": "Direct",
+        "requested": "[5.6.7, )",
+        "resolved": "5.6.7",
+        "contentHash": "WIE9RJswdSc2j+rLz2gW6U+gMUjMHzY2j7C/CL8/R2olXNM/+twarfMnWqm+rZodDBvaYDApJyxM8mVYf9FGrQ=="
+      },
       "Microsoft.Extensions.AmbientMetadata.Application": {
         "type": "Transitive",
         "resolved": "10.2.0",

src/GmRelay.Shared/packages.lock.json

@@ -1,6 +1,13 @@
 {
   "version": 1,
   "dependencies": {
-    "net10.0": {}
+    "net10.0": {
+      "SecurityCodeScan.VS2019": {
+        "type": "Direct",
+        "requested": "[5.6.7, )",
+        "resolved": "5.6.7",
+        "contentHash": "WIE9RJswdSc2j+rLz2gW6U+gMUjMHzY2j7C/CL8/R2olXNM/+twarfMnWqm+rZodDBvaYDApJyxM8mVYf9FGrQ=="
+      }
+    }
   }
 }

src/GmRelay.Web/Components/Layout/NavMenu.razor

@@ -56,7 +56,7 @@
                     </button>
                 </form>
 
-                <div class="nav-version">v1.14.0</div>
+                <div class="nav-version">v1.15.0</div>
             </div>
         </Authorized>
         <NotAuthorized>

src/GmRelay.Web/packages.lock.json

@@ -32,6 +32,12 @@
         "resolved": "10.0.2",
         "contentHash": "q5RfBI+wywJSFUNDE1L4ZbHEHCFTblo8Uf6A6oe4feOUFYiUQXyAf9GBh5qEZpvJaHiEbpBPkQumjEhXCJxdrg=="
       },
+      "SecurityCodeScan.VS2019": {
+        "type": "Direct",
+        "requested": "[5.6.7, )",
+        "resolved": "5.6.7",
+        "contentHash": "WIE9RJswdSc2j+rLz2gW6U+gMUjMHzY2j7C/CL8/R2olXNM/+twarfMnWqm+rZodDBvaYDApJyxM8mVYf9FGrQ=="
+      },
       "Telegram.Bot": {
         "type": "Direct",
         "requested": "[22.9.6.1, )",