[AZ-513] [AZ-196] [AZ-183] Add /classes CRUD, /devices, fleet OTA

AZ-513: POST/PATCH/DELETE /classes for detection-class CRUD; new
DetectionClass entity, schema, DTOs, IDetectionClassService. Unblocks
ui/AZ-512.

AZ-196: POST /devices auto-assigns sequential azj-NNNN serial+email
+password and inserts a CompanionPC user. Returns plaintext credentials
for the provisioning script.

AZ-183: Resources table + POST /get-update + POST /resources/publish
for fleet OTA. Per-resource encryption_key column AES-256-CBC encrypted
at rest with ResourcesConfig.EncryptionMasterKey; ICache wraps the
per-(arch,stage) latest-versions lookup and is invalidated on publish.

Adds IDbFactory.RunAdmin<T> overload for write-and-return.

Backfills _docs/02_document/module-layout.md to satisfy the implement
skill's File Ownership prerequisite (the _docs/ artifact set predates
the Step 1.5 module-layout addition).

Code review: PASS_WITH_WARNINGS — see
_docs/03_implementation/reviews/batch_05_review.md.

Co-authored-by: Cursor <cursoragent@cursor.com>

Azaion.Common/Database/DbFactory.cs

@@ -10,6 +10,7 @@ public interface IDbFactory
     Task<T> Run<T>(Func<AzaionDb, Task<T>> func);
     Task Run(Func<AzaionDb, Task> func);
     Task RunAdmin(Func<AzaionDb, Task> func);
+    Task<T> RunAdmin<T>(Func<AzaionDb, Task<T>> func);
 }
 
 public class DbFactory : IDbFactory
@@ -54,4 +55,10 @@ public class DbFactory : IDbFactory
         await using var db = new AzaionDb(_dataOptionsAdmin);
         await func(db);
     }
+
+    public async Task<T> RunAdmin<T>(Func<AzaionDb, Task<T>> func)
+    {
+        await using var db = new AzaionDb(_dataOptionsAdmin);
+        return await func(db);
+    }
 }