feat(db): migration 20260429130352 — alter Profile encrypted columns to text

Generated by `prisma migrate dev --name encrypt_profile_fields`.

ALTER TABLE "profiles" sets weight_start_kg / weight_current_kg /
weight_goal_kg / target_date to TEXT. Existing rows keep their decimal
representation as plaintext text (e.g. "76.00") and prisma-field-encryption
re-encrypts them on the next write — both ciphertext (v1.aesgcm256.<keyId>.
<iv>.<ciphertext>) and legacy plaintext are decrypted transparently on read,
so no app-level fallback was needed.

Verified end-to-end:
- pnpm test:e2e — all 4 specs pass, including profile signup → submit →
  BMR 1583 / TDEE 1899 round-trip
- raw SQL on profiles shows ciphertext for new rows; older rows stay in clear
  text until their next update

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/db/prisma/migrations/20260429130352_encrypt_profile_fields/migration.sql

@@ -0,0 +1,5 @@
+-- AlterTable
+ALTER TABLE "profiles" ALTER COLUMN "weight_start_kg" SET DATA TYPE TEXT,
+ALTER COLUMN "weight_current_kg" SET DATA TYPE TEXT,
+ALTER COLUMN "weight_goal_kg" SET DATA TYPE TEXT,
+ALTER COLUMN "target_date" SET DATA TYPE TEXT;