Rename firma to atCompany on server and client

Renames the Zeiterfassung-vs-home flag to a clearer English name
(SQL alias AT_COMPANY, model property AT_COMPANY, JSON atCompany)
in both the server query/model and the client AvailabilityInfo
type and people-tile renderer.

client/src/availability-info.ts

@@ -3,5 +3,5 @@ export class AvailabilityInfo {
   public loggedIn: boolean;
   public extension: string;
   public lastStamp: Date;
-  public firma: boolean;
+  public atCompany: boolean;
 }

client/src/availability.ts

@@ -73,7 +73,7 @@ export class Availability {
     }
     var location = ''
     if (entry.loggedIn) {
-      location = entry.firma ? ' · Büro' : ' · Home'
+      location = entry.atCompany ? ' · Büro' : ' · Home'
     }
     indicator.innerHTML = '<span class="tapi-dot ' + dotClass + '"></span><small>' + time + location + '</small>'
   }

server/src/CPATapi.Server/Models/Availability.cs

@@ -13,6 +13,6 @@ public class Availability
     public string? US_EXTENSION { get; set; }
     [JsonPropertyName("lastStamp")]
     public DateTime? LAST_STAMP { get; set; }
-    [JsonPropertyName("firma")]
-    public bool? FIRMA { get; set; }
+    [JsonPropertyName("atCompany")]
+    public bool? AT_COMPANY { get; set; }
 }

server/src/CPATapi.Server/Repository/ZeitConsensRepository.cs

@@ -12,7 +12,7 @@ internal class ZeitConsensRepository(IConfiguration config) : Repository(config)
           ,bu.LOGGED_IN
           ,us.US_EXTENSION
           ,buLast.LAST_STAMP
-          ,buLast.FIRMA
+          ,buLast.AT_COMPANY
         FROM dbo.MA_DATEN ma
         INNER JOIN projectmanagement.dbo.CP_USER us ON us.US_LOGINNAME = ma.MA_USER_NAME
         OUTER APPLY (
@@ -24,7 +24,7 @@ internal class ZeitConsensRepository(IConfiguration config) : Repository(config)
         OUTER APPLY (
           SELECT TOP 1
              bu.BU_BU AS LAST_STAMP
-            ,CASE WHEN bu.BU_TERM = 'Zeiterfassung' THEN 1 ELSE 0 END AS FIRMA
+            ,CASE WHEN bu.BU_TERM = 'Zeiterfassung' THEN 1 ELSE 0 END AS AT_COMPANY
           FROM dbo.BU bu
           WHERE bu.BU_MA_NR = ma.MA_NR
           ORDER BY bu.BU_BU DESC