[init] Add initial database migration files for PostgreSQL, SQLite, and MySQL

api/migrations/sqlite3/001_init.down.sql

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+-- ===========
+--  Down Migration for 001_init
+-- ===========
+
+-- Drop indexes (reverse of creation order isn't required for indexes, but do before tables)
+DROP INDEX IF EXISTS idx_routes_project_id;
+DROP INDEX IF EXISTS idx_projects_workspace_id;
+DROP INDEX IF EXISTS idx_workspaces_owner_id;
+
+-- ===========
+--  Product Logic (Projects & Routes)
+-- ===========
+DROP TABLE IF EXISTS routes;
+DROP TABLE IF EXISTS projects;
+
+-- ===========
+--  RBAC (Roles & Permissions)
+-- ===========
+DROP TABLE IF EXISTS role_permissions;
+DROP TABLE IF EXISTS permissions;
+DROP TABLE IF EXISTS roles;
+
+-- ===========
+--  Tenancy (Workspaces & Members)
+-- ===========
+DROP TABLE IF EXISTS workspace_members;
+DROP TABLE IF EXISTS workspaces;
+
+-- ===========
+--  Users & Plans
+-- ===========
+DROP TABLE IF EXISTS plans;
+DROP TABLE IF EXISTS users;