feat(03-01): add clients and documents tables to Drizzle schema

- Add pgEnum import and documentStatusEnum (Draft, Sent, Viewed, Signed)
- Add clients table (id, name, email, createdAt, updatedAt)
- Add documents table (id, name, clientId FK, status enum, sentAt, createdAt)
- Generate migration 0001_watery_blindfold.sql and apply to local PostgreSQL

teressa-copeland-homes/drizzle/meta/_journal.json

@@ -8,6 +8,13 @@
       "when": 1773948629637,
       "tag": "0000_milky_black_cat",
       "breakpoints": true
+    },
+    {
+      "idx": 1,
+      "version": "7",
+      "when": 1773958608977,
+      "tag": "0001_watery_blindfold",
+      "breakpoints": true
     }
   ]
 }