feat(04-01): add formTemplates table and extend documents schema

- Add formTemplates table (id text PK, name, filename unique, createdAt, updatedAt)
- Add formTemplateId (nullable FK) and filePath (nullable text) to documents table
- Generate and apply migration 0002_wealthy_zzzax.sql
- Create seeds/forms/.gitkeep to track seed directory in git

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

@@ -15,6 +15,13 @@
       "when": 1773958608977,
       "tag": "0001_watery_blindfold",
       "breakpoints": true
+    },
+    {
+      "idx": 2,
+      "version": "7",
+      "when": 1773977523128,
+      "tag": "0002_wealthy_zzzax",
+      "breakpoints": true
     }
   ]
 }