fix(rpc): move injected @citizenfx/* types to separate file

rpc/src/fivem.d.ts

@@ -0,0 +1,36 @@
+/*
+FiveM runtime globals used by this library. Internal: not part of the published types, so consumers are free to use @citizenfx/*.
+See https://docs.fivem.net/docs/scripting-reference/runtimes/javascript/
+*/
+
+// ===== SHARED (client + server) =====
+
+declare function on<A extends unknown[]>(
+	eventName: string,
+	callback: (...args: A) => unknown,
+): void
+declare function onNet<A extends unknown[]>(
+	eventName: string,
+	callback: (...args: A) => unknown,
+): void
+/** Server: `emitNet(eventName, target, ...args)` */
+declare function emitNet(eventName: string, ...args: unknown[]): void
+declare function RegisterCommand<A extends unknown[]>(
+	commandName: string,
+	handler: (source: number, args: A, rawCommand: string) => unknown,
+	restricted: boolean,
+): void
+
+// ===== CLIENT =====
+
+declare function RegisterNuiCallbackType(callbackType: string): void
+declare function GetPlayerServerId(player: number): number
+declare function PlayerId(): number
+declare function SetNuiFocus(hasFocus: boolean, hasCursor: boolean): void
+declare function SendNuiMessage(jsonString: string): boolean
+
+// ===== WEBVIEW (NUI) =====
+
+interface Window {
+	GetParentResourceName?: () => string
+}