Improve SSR auth bootstrap and align GraphQL communication fields

Frontend/server/graphql/schema.ts

@@ -388,7 +388,7 @@ async function getDashboard(auth: AuthContext | null) {
     kind: m.kind === "CALL" ? "call" : "message",
     direction: m.direction === "IN" ? "in" : "out",
     text: m.content,
-    audioUrl: m.audioUrl ?? "",
+    audioUrl: "",
     duration: m.durationSec ? new Date(m.durationSec * 1000).toISOString().slice(14, 19) : "",
     transcript: Array.isArray(m.transcriptJson) ? ((m.transcriptJson as any) as string[]) : [],
   }));
@@ -542,7 +542,6 @@ async function createCommunication(auth: AuthContext | null, input: {
       direction: input?.direction === "in" ? "IN" : "OUT",
       channel: toDbChannel(input?.channel ?? "Phone") as any,
       content: (input?.text ?? "").trim(),
-      audioUrl: (input?.audioUrl ?? "").trim() || null,
       durationSec: typeof input?.durationSec === "number" ? input.durationSec : null,
       transcriptJson: Array.isArray(input?.transcript) ? input.transcript : undefined,
       occurredAt,