Add MariaDB/PostgreSQL support and 100% test coverage

[Copilot]

Superseded by issue #2 for a migration-safe rebuild from current protected develop.

The branch contains valuable test coverage and multi-provider exploration, but its current exact head cannot be merged safely. Current-head Security Scan fails on fixable brace-expansion, postcss, undici, and frontend react-router findings. More importantly, this branch changes the production db:migrate:deploy path from prisma migrate deploy to prisma db push --skip-generate, and the PostgreSQL-specific deployment path also uses db push despite shipping an explicit migration. That converts a reviewed migration workflow into runtime schema drift.

The provider schemas also replicate physical single-word table names such as users, files, and folders; these violate the CWL database naming contract requiring descriptive two-or-more-word snake_case object names. Multi-valued JSON fields also need a deliberate 1NF/3NF review instead of being copied across four provider schemas without a normalization decision.

Issue #2 preserves the useful work and defines the canonical rebuild: port the tests first, regenerate patched locks, converge on one provider-neutral logical schema, use explicit reversible migrations, normalize relational data to 3NF, validate upgrade/rollback on MySQL/MariaDB/PostgreSQL/SQLite, and only then merge/release. Keep this branch available as source material until those tests/provider deltas have been absorbed.

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📥 Commits

Reviewing files that changed from the base of the PR and between fea4e44 and 8430d78.

⛔ Files ignored due to path filters (1)

• backend/package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (50)

• README.md
• backend/.gitignore
• backend/Dockerfile
• backend/package.json
• backend/prisma/migrations-mysql/README.md
• backend/prisma/migrations-postgresql/.gitkeep
• backend/prisma/migrations-postgresql/20260604000000_init/migration.sql
• backend/prisma/migrations-postgresql/README.md
• backend/prisma/migrations-postgresql/migration_lock.toml
• backend/prisma/migrations-sqlite/.gitkeep
• backend/prisma/migrations-sqlite/README.md
• backend/prisma/schema.mariadb.prisma
• backend/prisma/schema.mysql.prisma
• backend/prisma/schema.postgresql.prisma
• backend/prisma/schema.prisma
• backend/prisma/schema.sqlite.prisma
• backend/src/app.test.ts
• backend/src/config/env.test.ts
• backend/src/config/prisma.test.ts
• backend/src/middleware/api-key.middleware.test.ts
• backend/src/middleware/auth.middleware.test.ts
• backend/src/middleware/error.middleware.test.ts
• backend/src/modules/api-keys/api-key.routes.test.ts
• backend/src/modules/audit-logs/audit-log.routes.test.ts
• backend/src/modules/auth/auth.routes.test.ts
• backend/src/modules/connected-accounts/connected-account.routes.test.ts
• backend/src/modules/files/file.routes.test.ts
• backend/src/modules/files/stream-file.test.ts
• backend/src/modules/files/stream-google-file.test.ts
• backend/src/modules/folders/folder.routes.test.ts
• backend/src/modules/google/google.service.test.ts
• backend/src/modules/invites/invite.routes.test.ts
• backend/src/modules/provider-configs/provider-config.routes.test.ts
• backend/src/modules/public/public.routes.test.ts
• backend/src/modules/s3/s3.service.test.ts
• backend/src/modules/storage/storage.routes.test.ts
• backend/src/modules/system/system.routes.test.ts
• backend/src/modules/uploads/upload.routes.test.ts
• backend/src/modules/uploads/upload.routes.ts
• backend/src/test/setup.ts
• backend/src/utils/audit.test.ts
• backend/src/utils/audit.ts
• backend/src/utils/crypto.test.ts
• backend/src/utils/crypto.ts
• backend/src/utils/jwt.test.ts
• backend/src/utils/password.test.ts
• backend/vitest.config.ts
• docker-compose.yml
• frontend/Dockerfile
• frontend/nginx.conf

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