Add Azure Blob Storage archive & email safety net

- Add AzureBlobStorageService, DocumentArchiveSyncService, and related config for secondary PDF archiving of invoices/reminders
- Add SQL procs and schema changes for archive backfill
- Update invoice/reminder services to upload PDFs to blob storage
- Add telemetry counters and unit tests for blob storage/archive logic
- Add Fuchs:Email:OverrideRecipient config and enforce dev/test email redirect in ProcessWebComService, with tests
- Improve JS date parsing (German formats), stricter JSON date detection
- Increase widget SQL timeouts, update dependencies, docs, and project files

Fuchs/appsettings.json

@@ -5,10 +5,9 @@
     "CacheFilePath": "secrets.cache",
     "SyncIntervalHours": 6,
     "ManagedSecretKeys": [
-      "ConnectionStrings--ocms-username",
-      "ConnectionStrings--ocms-password",
       "ConnectionStrings--fuchs-fds-username",
       "ConnectionStrings--fuchs-fds-password",
+      "ConnectionStrings--AzureBlobStorage-ConnectionString",
       "Fuchs--SMS-APIKey",
       "Fuchs--Mailer--Token",
       "Fuchs--fuchs-captcha-TOTP",
@@ -23,12 +22,10 @@
   },
   "AllowedHosts": "*",
   "ConnectionStrings": {
-    "ocms_ConnectionString": "Server=DB_SERVER;Database=ocms;User Id={username};Password={password};TrustServerCertificate=True;",
-    "fuchs_fds_ConnectionString": "Server=DB_SERVER;Database=fuchs_fds;User Id={username};Password={password};TrustServerCertificate=True;",
-    "ocms_username": "MANAGED_BY_KEYVAULT",
-    "ocms_password": "MANAGED_BY_KEYVAULT",
+    "fuchs_fds_ConnectionString": "Data Source=MSSQL4.NBG4.DOMAINXYZ.DE,10439;Initial Catalog=site_fuchs_dev;Persist Security Info=False;TrustServerCertificate=true;Encrypt=true;User ID={username};password='{password}';Connect Timeout=60;Load Balance Timeout=240;Max Pool Size=500;",
     "fuchs_fds_username": "MANAGED_BY_KEYVAULT",
-    "fuchs_fds_password": "MANAGED_BY_KEYVAULT"
+    "fuchs_fds_password": "MANAGED_BY_KEYVAULT",
+    "AzureBlobStorage_ConnectionString": "MANAGED_BY_KEYVAULT"
   },
   "Fuchs": {
     "ocms_guid": "00094b8f-a822-4e9c-b627-87802f93fca8",
@@ -45,6 +42,15 @@
       "Token": "MANAGED_BY_KEYVAULT",
       "Enabled": false
     },
+    "Email": {
+      "OverrideRecipient": ""
+    },
+    "AzureStorage": {
+      "Enabled": false,
+      "InvoiceContainer": "fuchs-invoices",
+      "ReminderContainer": "fuchs-reminders",
+      "MetadataFields": [ "Id", "Version", "InvoiceId", "InvoiceTitle", "InvId", "DocumentName", "file_guid" ]
+    },
     "Telemetry": {
       "Enabled": true,
       "OtlpEndpoint": ""