major rework of backend loading and usage:

- split config from user data to config.json, add config.hson.template
- moved default user data localdb to root folder
- moved pve, localdb, ldap backend handlers to backends sub folder
- add dynamic loading of all backends
- add dynamic mapping for auth backends to support multiple auth sources
- update affected endpoints

src/backends/localdb.js

@@ -0,0 +1,71 @@
+import { readFileSync, writeFileSync } from "fs";
+import { exit } from "process";
+
+export default class LocalDB {
+	#path = null;
+	#data = null;
+	#defaultuser = null;
+	constructor (config) {
+		const path = config.dbfile;
+		try {
+			this.#path = path;
+			this.#load();
+			this.#defaultuser = global.config.defaultuser;
+		}
+		catch {
+			console.log(`Error: ${path} was not found. Please follow the directions in the README to initialize localdb.json.`);
+			exit(1);
+		}
+	}
+
+	/**
+	 * Load db from local file system. Reads from file path store in path.
+	 */
+	#load () {
+		this.#data = JSON.parse(readFileSync(this.#path));
+	}
+
+	/**
+	 * Save db to local file system. Saves to file path stored in path.
+	 */
+	#save () {
+		writeFileSync(this.#path, JSON.stringify(this.#data));
+	}
+
+	addUser (username, config = null) {
+		config = config || this.#defaultuser;
+		this.#data.users[username] = config;
+		this.#save();
+	}
+
+	getUser (username) {
+		if (this.#data.users[username]) {
+			return this.#data.users[username];
+		}
+		else {
+			return null;
+		}
+	}
+
+	setUser (username, config) {
+		if (this.#data.users[username]) {
+			this.#data.users[username] = config;
+			this.#save();
+			return true;
+		}
+		else {
+			return false;
+		}
+	}
+
+	delUser (username) {
+		if (this.#data.users[username]) {
+			delete this.#data.users[username];
+			this.#save();
+			return true;
+		}
+		else {
+			return false;
+		}
+	}
+}