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

ts/radius/classes.accounting.manager.ts

@@ -518,8 +518,8 @@ export class AccountingManager {
       if (deletedCount > 0) {
         logger.log('info', `Cleaned up ${deletedCount} old accounting sessions`);
       }
-    } catch (error) {
-      logger.log('error', `Failed to cleanup old sessions: ${error.message}`);
+    } catch (error: unknown) {
+      logger.log('error', `Failed to cleanup old sessions: ${(error as Error).message}`);
     }
 
     return deletedCount;
@@ -582,8 +582,8 @@ export class AccountingManager {
           // Ignore individual errors
         }
       }
-    } catch (error) {
-      logger.log('warn', `Failed to load active sessions: ${error.message}`);
+    } catch (error: unknown) {
+      logger.log('warn', `Failed to load active sessions: ${(error as Error).message}`);
     }
   }
 
@@ -598,8 +598,8 @@ export class AccountingManager {
     const key = `${this.config.storagePrefix}/active/${session.sessionId}.json`;
     try {
       await this.storageManager.setJSON(key, session);
-    } catch (error) {
-      logger.log('error', `Failed to persist session ${session.sessionId}: ${error.message}`);
+    } catch (error: unknown) {
+      logger.log('error', `Failed to persist session ${session.sessionId}: ${(error as Error).message}`);
     }
   }
 
@@ -620,8 +620,8 @@ export class AccountingManager {
       const date = new Date(session.endTime);
       const archiveKey = `${this.config.storagePrefix}/archive/${date.getFullYear()}/${String(date.getMonth() + 1).padStart(2, '0')}/${String(date.getDate()).padStart(2, '0')}/${session.sessionId}.json`;
       await this.storageManager.setJSON(archiveKey, session);
-    } catch (error) {
-      logger.log('error', `Failed to archive session ${session.sessionId}: ${error.message}`);
+    } catch (error: unknown) {
+      logger.log('error', `Failed to archive session ${session.sessionId}: ${(error as Error).message}`);
     }
   }
 
@@ -653,8 +653,8 @@ export class AccountingManager {
           // Ignore individual errors
         }
       }
-    } catch (error) {
-      logger.log('warn', `Failed to get archived sessions: ${error.message}`);
+    } catch (error: unknown) {
+      logger.log('warn', `Failed to get archived sessions: ${(error as Error).message}`);
     }
 
     return sessions;

ts/radius/classes.radius.server.ts

@@ -310,8 +310,8 @@ export class RadiusServer {
         default:
           logger.log('debug', `RADIUS Acct Unknown status type: ${statusType}`);
       }
-    } catch (error) {
-      logger.log('error', `RADIUS accounting error: ${error.message}`);
+    } catch (error: unknown) {
+      logger.log('error', `RADIUS accounting error: ${(error as Error).message}`);
     }
 
     return { code: plugins.smartradius.ERadiusCode.AccountingResponse };

ts/radius/classes.vlan.manager.ts

@@ -104,7 +104,7 @@ export class VlanManager {
     if (this.normalizedMacCache.size > 10000) {
       const iterator = this.normalizedMacCache.keys();
       for (let i = 0; i < 1000; i++) {
-        this.normalizedMacCache.delete(iterator.next().value);
+        this.normalizedMacCache.delete(iterator.next().value!);
       }
     }
 
@@ -348,8 +348,8 @@ export class VlanManager {
         }
         logger.log('info', `Loaded ${data.length} VLAN mappings from storage`);
       }
-    } catch (error) {
-      logger.log('warn', `Failed to load VLAN mappings from storage: ${error.message}`);
+    } catch (error: unknown) {
+      logger.log('warn', `Failed to load VLAN mappings from storage: ${(error as Error).message}`);
     }
   }
 
@@ -364,8 +364,8 @@ export class VlanManager {
     try {
       const mappings = Array.from(this.mappings.values());
       await this.storageManager.setJSON(this.config.storagePrefix, mappings);
-    } catch (error) {
-      logger.log('error', `Failed to save VLAN mappings to storage: ${error.message}`);
+    } catch (error: unknown) {
+      logger.log('error', `Failed to save VLAN mappings to storage: ${(error as Error).message}`);
     }
   }
 }