fix(typescript): tighten TypeScript null safety and error handling across backend and ops UI

ts/cache/documents/classes.cached.email.ts

@@ -35,55 +35,55 @@ export class CachedEmail extends CachedDocument<CachedEmail> {
    */
   @plugins.smartdata.unI()
   @plugins.smartdata.svDb()
-  public id: string;
+  public id!: string;
 
   /**
    * Email message ID (RFC 822 Message-ID header)
    */
   @plugins.smartdata.svDb()
-  public messageId: string;
+  public messageId!: string;
 
   /**
    * Sender email address (envelope from)
    */
   @plugins.smartdata.svDb()
-  public from: string;
+  public from!: string;
 
   /**
    * Recipient email addresses
    */
   @plugins.smartdata.svDb()
-  public to: string[];
+  public to!: string[];
 
   /**
    * CC recipients
    */
   @plugins.smartdata.svDb()
-  public cc: string[];
+  public cc!: string[];
 
   /**
    * BCC recipients
    */
   @plugins.smartdata.svDb()
-  public bcc: string[];
+  public bcc!: string[];
 
   /**
    * Email subject
    */
   @plugins.smartdata.svDb()
-  public subject: string;
+  public subject!: string;
 
   /**
    * Raw RFC822 email content
    */
   @plugins.smartdata.svDb()
-  public rawContent: string;
+  public rawContent!: string;
 
   /**
    * Current status of the email
    */
   @plugins.smartdata.svDb()
-  public status: TCachedEmailStatus;
+  public status!: TCachedEmailStatus;
 
   /**
    * Number of delivery attempts
@@ -101,25 +101,25 @@ export class CachedEmail extends CachedDocument<CachedEmail> {
    * Timestamp for next delivery attempt
    */
   @plugins.smartdata.svDb()
-  public nextAttempt: Date;
+  public nextAttempt!: Date;
 
   /**
    * Last error message if delivery failed
    */
   @plugins.smartdata.svDb()
-  public lastError: string;
+  public lastError!: string;
 
   /**
    * Timestamp when the email was successfully delivered
    */
   @plugins.smartdata.svDb()
-  public deliveredAt: Date;
+  public deliveredAt!: Date;
 
   /**
    * Sender domain (for querying/filtering)
    */
   @plugins.smartdata.svDb()
-  public senderDomain: string;
+  public senderDomain!: string;
 
   /**
    * Priority level (higher = more important)
@@ -131,7 +131,7 @@ export class CachedEmail extends CachedDocument<CachedEmail> {
    * JSON-serialized route data
    */
   @plugins.smartdata.svDb()
-  public routeData: string;
+  public routeData!: string;
 
   /**
    * DKIM signature status