chore(01-02): generate Drizzle migration from schema (0000_pretty_typhoid_mary.sql)

- 10 tables: clients, phases, tasks, deliverables, comments, payments,
  documents, notes, service_catalog, quote_items
- UNIQUE constraint on clients.token enforced at DB level
- All FK cascades correct (deliverables->tasks->phases->clients)
- approved_at: timestamp with time zone (nullable, immutable)
- drizzle.config.ts already correct from Plan 01 (no changes needed)

src/db/migrations/meta/_journal.json

@@ -0,0 +1,13 @@
+{
+  "version": "7",
+  "dialect": "postgresql",
+  "entries": [
+    {
+      "idx": 0,
+      "version": "7",
+      "when": 1778705200462,
+      "tag": "0000_pretty_typhoid_mary",
+      "breakpoints": true
+    }
+  ]
+}