Add MariaDB integration and repositories

Introduce DB support and repos: add modules/database.js (connection pool + runDDL) and SQL DDL files (data/ddl/*) for servers, users, providers, identities and credentials. Add repository layers: users, servers, providers, identities, credentials. Update server.js to run DDL at startup. Update .env.example with DB settings and bump dependencies in package.json/package-lock.json (add mariadb, bump dotenv/helmet/path-to-regexp/zod and dev tool upgrades). Error handling and logging included for DDL and repo operations.

server.js

@@ -9,6 +9,7 @@ const helmet = require("helmet")
 const loader = require("./modules/loader")
 const DefaultError = require("./errors/DefaultError")
 const path2regex = require("path-to-regexp")
+const database = require("./modules/database")
 
 const routes = loader.getRecursiveFiles(path.join(__dirname, "routes"))
 const schemas = loader.getRecursiveFiles(path.join(__dirname, "schemas"))
@@ -24,6 +25,9 @@ app.use(express.urlencoded({ extended: true }))
 
 app.set("trust proxy", true)
 
+database.runDDL()
+.catch(err => logger.error(err))
+
 logger.log("Initializing routes", ["WEB", "yellow"])
 
 for (const schemaFile of schemas) {