feat: implement link embed functionality to enhance message previews with metadata and thumbnails

src/EchoHub.Server/Controllers/AuthController.cs

@@ -22,6 +22,7 @@ public class AuthController : ControllerBase
         _db = db;
         _jwt = jwt;
     }
+
     [HttpPost("register")]
     public async Task<IActionResult> Register([FromBody] RegisterRequest request)
     {

src/EchoHub.Server/Controllers/ChannelsController.cs

@@ -37,6 +37,7 @@ public class ChannelsController : ControllerBase
         _httpClientFactory = httpClientFactory;
         _chatService = chatService;
     }
+
     [HttpGet]
     public async Task<IActionResult> GetChannels([FromQuery] int offset = 0, [FromQuery] int limit = 50)
     {

src/EchoHub.Server/Controllers/FilesController.cs

@@ -18,6 +18,7 @@ public class FilesController : ControllerBase
     {
         _fileStorage = fileStorage;
     }
+
     [HttpGet("{fileId}")]
     public IActionResult GetFile(string fileId)
     {

src/EchoHub.Server/Controllers/ServerController.cs

@@ -17,6 +17,7 @@ public class ServerController : ControllerBase
         _db = db;
         _config = config;
     }
+
     [HttpGet("info")]
     public async Task<IActionResult> GetInfo()
     {

src/EchoHub.Server/Controllers/UsersController.cs

@@ -24,6 +24,7 @@ public class UsersController : ControllerBase
         _db = db;
         _asciiService = asciiService;
     }
+
     [HttpGet("{username}/profile")]
     public async Task<IActionResult> GetProfile(string username)
     {