End to end encrypted attachment upload and streaming

prisma/migrations/20260116141809_chunk_iv_binary/migration.sql

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+/*
+  Warnings:
+
+  - Changed the type of `iv` on the `Chunk` table. No cast exists, the column would be dropped and recreated, which cannot be done if there is data, since the column is required.
+
+*/
+-- AlterTable
+ALTER TABLE "Chunk" DROP COLUMN "iv",
+ADD COLUMN     "iv" BYTEA NOT NULL;