feat(20-02): add clientTranscripts data layer

schema.ts: clientTranscripts table (id, lead_id/client_id nullable FKs,
title, content NOT NULL, call_date, created_at) + leadsRelations/
clientsRelations updated + clientTranscriptsRelations + TS types.

lead-service.ts: getTranscripts(leadId) — call_date DESC ordering.

actions.ts: addTranscript + deleteTranscript with requireAdmin guard,
Zod validation, and revalidatePath. TypeScript: no errors.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/lead-service.ts

@@ -1,6 +1,6 @@
 import { eq, and, isNull, desc, gte, lte, ilike, or } from "drizzle-orm";
 import { db } from "@/db";
-import { leads, activities, reminders, quotes } from "@/db/schema";
+import { leads, activities, reminders, quotes, clientTranscripts } from "@/db/schema";
 
 // Get all leads
 export async function getAllLeads(limit: number = 100, offset: number = 0) {
@@ -209,3 +209,13 @@ export async function getQuotesByLeadId(leadId: string) {
     .where(eq(quotes.lead_id, leadId))
     .orderBy(desc(quotes.created_at));
 }
+
+// Get transcript log for a lead — call_date DESC (D-05)
+// Returns all fields including full content (Phase 21 reads them in bulk).
+export async function getTranscripts(leadId: string) {
+  return await db
+    .select()
+    .from(clientTranscripts)
+    .where(eq(clientTranscripts.lead_id, leadId))
+    .orderBy(desc(clientTranscripts.call_date));
+}