Add delete repository feature

GitService.deleteRepository() removes both worktree and git-dir.
Exposed via POST /repo/{name}/delete, a 'Danger Zone' section on
the repo page, and telnet main menu option 4 with confirmation
prompt. Includes unit tests for all layers.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/main/java/be/seeseepuff/webgit/controller/RepoController.java

@@ -78,4 +78,11 @@ public class RepoController
 		gitService.pull(name);
 		return "redirect:/repo/" + name;
 	}
+
+	@PostMapping("/repo/{name}/delete")
+	public String delete(@PathVariable String name) throws IOException
+	{
+		gitService.deleteRepository(name);
+		return "redirect:/";
+	}
 }

src/main/java/be/seeseepuff/webgit/service/GitService.java

@@ -56,6 +56,37 @@ public class GitService
 		}
 	}
 
+	public void deleteRepository(String name) throws IOException
+	{
+		Path worktree = properties.getWorktreePath().resolve(name);
+		Path gitDir = properties.getGitDirPath().resolve(name);
+
+		deleteRecursively(gitDir);
+		deleteRecursively(worktree);
+	}
+
+	private void deleteRecursively(Path path) throws IOException
+	{
+		if (!Files.exists(path))
+			return;
+
+		try (Stream<Path> walk = Files.walk(path))
+		{
+			walk.sorted(java.util.Comparator.reverseOrder())
+				.forEach(p ->
+				{
+					try
+					{
+						Files.delete(p);
+					}
+					catch (IOException e)
+					{
+						throw new java.io.UncheckedIOException(e);
+					}
+				});
+		}
+	}
+
 	public List<String> listBranches(String name) throws IOException, GitAPIException
 	{
 		try (Git git = openRepository(name))

src/main/java/be/seeseepuff/webgit/telnet/TelnetSession.java

@@ -40,6 +40,7 @@ public class TelnetSession implements Runnable
 			out.println("  1. List repositories");
 			out.println("  2. Clone a repository");
 			out.println("  3. Open a repository");
+			out.println("  4. Delete a repository");
 			out.println("  q. Quit");
 			out.print("> ");
 			out.flush();
@@ -56,6 +57,7 @@ public class TelnetSession implements Runnable
 				case "1" -> listRepositories();
 				case "2" -> cloneRepository();
 				case "3" -> openRepository();
+				case "4" -> deleteRepository();
 				default -> out.println("Invalid choice.");
 			}
 		}
@@ -96,6 +98,59 @@ public class TelnetSession implements Runnable
 		out.println("Cloned successfully.");
 	}
 
+	private void deleteRepository() throws IOException
+	{
+		List<String> repos = gitService.listRepositories();
+		if (repos.isEmpty())
+		{
+			out.println("No repositories to delete.");
+			return;
+		}
+
+		out.println("Repositories:");
+		for (int i = 0; i < repos.size(); i++)
+		{
+			out.println("  " + (i + 1) + ". " + repos.get(i));
+		}
+		out.print("Enter number to delete: ");
+		out.flush();
+
+		String input = in.readLine();
+		if (input == null || input.isBlank())
+			return;
+
+		int index;
+		try
+		{
+			index = Integer.parseInt(input.trim()) - 1;
+		}
+		catch (NumberFormatException e)
+		{
+			out.println("Invalid number.");
+			return;
+		}
+
+		if (index < 0 || index >= repos.size())
+		{
+			out.println("Invalid selection.");
+			return;
+		}
+
+		String name = repos.get(index);
+		out.print("Are you sure you want to delete '" + name + "'? (y/n): ");
+		out.flush();
+		String confirm = in.readLine();
+		if (confirm != null && "y".equalsIgnoreCase(confirm.trim()))
+		{
+			gitService.deleteRepository(name);
+			out.println("Deleted '" + name + "'.");
+		}
+		else
+		{
+			out.println("Cancelled.");
+		}
+	}
+
 	private void openRepository() throws IOException, GitAPIException
 	{
 		List<String> repos = gitService.listRepositories();

src/main/resources/templates/repo.html

@@ -99,5 +99,12 @@ New branch: <input type="text" name="branch" size="20">
 </tr>
 </table>
 
+<hr>
+
+<h3>Danger Zone</h3>
+<form method="post" th:action="@{/repo/{name}/delete(name=${name})}">
+<input type="submit" value="Delete Repository">
+</form>
+
 </body>
 </html>