Restructure scripts into dev/ and prod/ for the devcontainer

- scripts/prod: entrypoint, db-setup and schema.sql shipped in the image
- scripts/dev: seed/clear db, psql and cleanup, run natively in the
  devcontainer instead of via docker-compose
- move setup.cfg to the repo root so linters pick it up
- Makefile targets run directly in the devcontainer

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/prod/schema.sql

@@ -0,0 +1,31 @@
+CREATE TABLE IF NOT EXISTS domains (
+    name varchar PRIMARY KEY
+);
+
+CREATE TABLE IF NOT EXISTS emails (
+    id serial PRIMARY KEY,
+    email varchar(255) NOT NULL UNIQUE
+);
+
+-- Make emails unique by lower-case comparison
+CREATE UNIQUE INDEX IF NOT EXISTS email_unique_idx on emails (LOWER(email));
+
+CREATE TABLE IF NOT EXISTS users (
+    id serial PRIMARY KEY,
+    email_id integer REFERENCES emails(id) ON DELETE RESTRICT NOT NULL UNIQUE,
+    passwordhash varchar(255) NOT NULL,
+    enabled boolean NOT NULL DEFAULT TRUE,
+    is_admin boolean NOT NULL DEFAULT FALSE,
+    can_use_different_alias_domain boolean NOT NULL DEFAULT FALSE,
+    note text NOT NULL DEFAULT ''
+);
+
+-- source=me2@finn.st destination=me@finn.st: me2 is an alias of me
+CREATE TABLE IF NOT EXISTS aliases (
+    id serial PRIMARY KEY,
+    source_email_id integer REFERENCES emails(id) ON DELETE RESTRICT NOT NULL,
+    destination_user_id integer REFERENCES users(id) ON DELETE RESTRICT NOT NULL,
+    enabled boolean NOT NULL DEFAULT TRUE,
+    note text,
+    UNIQUE(source_email_id, destination_user_id)
+);