Add i18n, tests, and update documentation

Introduces internationalization (i18n) support with English and Turkish, adds unit tests and test setup with Vitest and React Testing Library, and updates documentation including README and changelog. Removes legacy publishing and usage guides, refactors components to use translation system, and updates build and test scripts in package.json. Also adds new utility modules for HLS and CORS, and improves PlayerContext and SettingsMenu for language support.

src/contexts/PlayerContext.tsx

@@ -1,5 +1,7 @@
 import React, { createContext, useContext, useRef, useState, useCallback } from 'react'
 import type { PlayerContextValue, VideoState, UIState, PlayerSettings, AudioTrack } from '../types'
+import type { Translations } from '../i18n'
+import { getTranslations, detectBrowserLanguage } from '../i18n'
 
 type SelectedQuality = PlayerSettings['quality']
 type SelectedSubtitle = PlayerSettings['subtitle']
@@ -7,6 +9,7 @@ type SelectedSubtitle = PlayerSettings['subtitle']
 interface PlayerContextType extends PlayerContextValue {
   setVideoState: React.Dispatch<React.SetStateAction<VideoState>>
   setUIState: React.Dispatch<React.SetStateAction<UIState>>
+  translations: Translations
 }
 
 const PlayerContext = createContext<PlayerContextType | null>(null)
@@ -25,6 +28,7 @@ interface PlayerProviderProps {
   initialVolume?: number
   initialMuted?: boolean
   initialPlaybackRate?: number
+  language?: string
 }
 
 export const PlayerProvider: React.FC<PlayerProviderProps> = ({
@@ -32,10 +36,14 @@ export const PlayerProvider: React.FC<PlayerProviderProps> = ({
   initialVolume = 1,
   initialMuted = false,
   initialPlaybackRate = 1,
+  language,
 }) => {
   const videoRef = useRef<HTMLVideoElement | null>(null)
   const containerRef = useRef<HTMLDivElement | null>(null)
 
+  // Get translations based on language prop or browser language
+  const translations = getTranslations(language || detectBrowserLanguage())
+
   const [videoState, setVideoState] = useState<VideoState>({
     playing: false,
     currentTime: 0,
@@ -169,6 +177,7 @@ export const PlayerProvider: React.FC<PlayerProviderProps> = ({
     containerRef,
     setVideoState,
     setUIState,
+    translations,
     play,
     pause,
     togglePlay,