Speed up tests: lower argon2 params in CI, env overrides

- Allow ARGON2_MEMORY_SIZE, ARGON2_ITERATIONS, ARGON2_PARALLELISM env overrides
- Use m=1024,t=1 in tests (was m=65536,t=4 → ~1s per hash)
- Set fast params in CI and deploy workflows

.gitea/workflows/ci.yaml

@@ -30,6 +30,8 @@ jobs:
           git checkout -f "${REF}"
 
           export SKIP_ENV_VALIDATION=1
+          export ARGON2_MEMORY_SIZE=1024
+          export ARGON2_ITERATIONS=1
           pnpm install --frozen-lockfile
           pnpm prisma:generate
           pnpm biome:lint

.gitea/workflows/deploy.yaml

@@ -307,6 +307,7 @@ jobs:
           pnpm install --frozen-lockfile
           # prisma generate does not need a live DB connection.
           pnpm prisma:generate
+          export ARGON2_MEMORY_SIZE=1024 ARGON2_ITERATIONS=1
           pnpm typecheck
           pnpm test
           # Validate production env (AUTH_SECRET, DATABASE_URL, …) during build.