Add firma flag to availability and show office/home label

Server query gets the last stamp's BU_TERM in the same OUTER APPLY
as LAST_STAMP, exposing FIRMA (1 = Zeiterfassung/Büro). Three OUTER
APPLYs reduced to two by combining MAX(BU_BU) with TOP 1 ORDER BY.

Client model gains a firma boolean and the people-tile indicator
appends "· Büro" or "· Home" next to the timestamp, but only when
the user is logged in.

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

@@ -11,21 +11,24 @@ internal class ZeitConsensRepository(IConfiguration config) : Repository(config)
            ma.MA_USER_NAME
           ,bu.LOGGED_IN
           ,us.US_EXTENSION
-          ,buLastStamp.LAST_STAMP
+          ,buLast.LAST_STAMP
+          ,buLast.FIRMA
         FROM dbo.MA_DATEN ma
-        INNER JOIN projectmanagement.dbo.CP_USER us on us.US_LOGINNAME = ma.MA_USER_NAME
+        INNER JOIN projectmanagement.dbo.CP_USER us ON us.US_LOGINNAME = ma.MA_USER_NAME
         OUTER APPLY (
-          SELECT count(*) % 2 AS LOGGED_IN
-          FROM dbo.BU
+          SELECT COUNT(*) % 2 AS LOGGED_IN
+          FROM dbo.BU bu
           WHERE bu.BU_MA_NR = ma.MA_NR
-          AND
-          BU_BU >= @from AND BU_BU < @to
+            AND bu.BU_BU >= @from AND bu.BU_BU < @to
         ) bu
         OUTER APPLY (
-          SELECT MAX(BU_BU) AS LAST_STAMP
-          FROM dbo.BU
+          SELECT TOP 1
+             bu.BU_BU AS LAST_STAMP
+            ,CASE WHEN bu.BU_TERM = 'Zeiterfassung' THEN 1 ELSE 0 END AS FIRMA
+          FROM dbo.BU bu
           WHERE bu.BU_MA_NR = ma.MA_NR
-        ) buLastStamp
+          ORDER BY bu.BU_BU DESC
+        ) buLast
         WHERE
           ma.MA_USER_AKTIV = 1
         """;