Fix Windows build process and add Windows asset extraction scripts

- Add missing MSYS2 packages to CI: vulkan-loader, vulkan-headers,
  shaderc, stormlib (both x86-64 and arm64), unicorn (arm64)
- Make vulkan-1.dll copy conditional via find_file (fixes MSYS2 builds)
- Use find_library for wininet/bz2 in asset_extract (graceful fallback)
- Add extract_assets.ps1 and extract_assets.bat for Windows users
- Expand BUILD_INSTRUCTIONS.md with MSYS2, vcpkg, and macOS sections
- Update README.md to reference Windows scripts and platforms

README.md

@@ -36,7 +36,7 @@ Protocol Compatible with **Vanilla (Classic) 1.12 + TBC 2.4.3 + WotLK 3.3.5a**.
 ### Asset Pipeline
 - Extracted loose-file **`Data/`** tree indexed by **`manifest.json`** (fast lookup + caching)
 - Optional **overlay layers** for multi-expansion asset deduplication
-- `asset_extract` + `extract_assets.sh` for MPQ extraction (StormLib tooling)
+- `asset_extract` + `extract_assets.sh` (Linux/macOS) / `extract_assets.ps1` (Windows) for MPQ extraction (StormLib tooling)
 - File formats: **BLP** (DXT1/3/5), **ADT**, **M2**, **WMO**, **DBC** (Spell/Item/Faction/etc.)
 
 ### Gameplay Systems
@@ -101,8 +101,12 @@ Wowee loads assets via an extracted loose-file tree indexed by `manifest.json` (
 #### 1) Extract MPQs into `./Data/`
 
 ```bash
-# WotLK 3.3.5a example
+# Linux / macOS
 ./extract_assets.sh /path/to/WoW/Data wotlk
+
+# Windows (PowerShell)
+.\extract_assets.ps1 "C:\Games\WoW-3.3.5a\Data" wotlk
+# Or double-click extract_assets.bat
 ```
 
 ```
@@ -117,7 +121,7 @@ Data/
 Notes:
 
 - `StormLib` is required to build/run the extractor (`asset_extract`), but the main client does not require StormLib at runtime.
-- `extract_assets.sh` supports `classic`, `tbc`, `wotlk` targets.
+- `extract_assets.sh` / `extract_assets.ps1` support `classic`, `tbc`, `wotlk` targets.
 
 #### 2) Point wowee at the extracted data
 
@@ -206,7 +210,7 @@ make -j$(nproc)
 
 ## Technical Details
 
-- **Platform**: Linux (primary), C++20, CMake 3.15+
+- **Platform**: Linux (primary), Windows (MSYS2/MSVC), macOS — C++20, CMake 3.15+
 - **Dependencies**: SDL2, Vulkan, GLM, OpenSSL, ImGui, FFmpeg, Unicorn Engine (StormLib for asset extraction tooling)
 - **Architecture**: Modular design with clear separation (core, rendering, networking, game logic, asset pipeline, UI, audio)
 - **Networking**: Non-blocking TCP, SRP6a authentication, RC4 encryption, WoW 3.3.5a protocol