feat(ssh-keys): add ssh-keys command to manage SSH public keys (#940)

## Summary

- Adds `tea ssh-keys` command group (aliases: `ssh-key`, `keys`) under the SETUP category
- Mirrors the interface of `gh ssh-key add/list/delete`
- Three subcommands: `add <keyfile>`, `list`, `delete <id>`

## Commands

\`\`\`sh
tea ssh-keys add ~/.ssh/id_ed25519.pub                     # title defaults to filename stem
tea ssh-keys add ~/.ssh/id_rsa.pub --title "work laptop"
tea ssh-keys add ~/.ssh/deploy.pub --read-only             # authentication-only key
tea ssh-keys list
tea ssh-keys list --output json
tea ssh-keys delete 42                                     # prompts for confirmation
tea ssh-keys delete 42 --force                             # skip prompt
\`\`\`

## Test plan

- [x] `make lint` — 0 issues
- [x] `make fmt-check` — passes
- [x] `go test ./cmd/sshkeys/... -run TestKeyTitle` — unit tests pass (no server needed)
- [ ] Integration tests with live Gitea instance:
  \`\`\`sh
  GITEA_TEA_TEST_URL=https://your-gitea \
  GITEA_TEA_TEST_TOKEN=<token> \
  go test ./cmd/sshkeys/... -v -run TestSSHKey
  \`\`\`
  Exercises full add → SDK-verify → delete → 404-verify lifecycle.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Brandon Fryslie <530235+brandon-fryslie@users.noreply.github.com>
Reviewed-on: https://gitea.com/gitea/tea/pulls/940
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Brandon Fryslie <186614+brandroid@noreply.gitea.com>
Co-committed-by: Brandon Fryslie <186614+brandroid@noreply.gitea.com>

tests/integration/repos_create_test.go

@@ -6,58 +6,18 @@ package integration
 import (
 	"context"
 	"fmt"
-	"os"
-	"path/filepath"
 	"testing"
 	"time"
 
 	"code.gitea.io/sdk/gitea"
 	"code.gitea.io/tea/cmd/repos"
-	"code.gitea.io/tea/modules/config"
-	"code.gitea.io/tea/modules/task"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"github.com/urfave/cli/v3"
 )
 
-func useTempConfigPath(t *testing.T) string {
-	t.Helper()
-
-	configPath := filepath.Join(t.TempDir(), "config.yml")
-	config.SetConfigPathForTesting(configPath)
-	t.Cleanup(func() {
-		config.SetConfigPathForTesting("")
-	})
-
-	return configPath
-}
-
-func createIntegrationLogin(t *testing.T, giteaURL string) *config.Login {
-	t.Helper()
-
-	_ = useTempConfigPath(t)
-
-	username := os.Getenv("GITEA_TEA_TEST_USERNAME")
-	password := os.Getenv("GITEA_TEA_TEST_PASSWORD")
-	require.NotEmpty(t, username, "GITEA_TEA_TEST_USERNAME is required for integration tests")
-	require.NotEmpty(t, password, "GITEA_TEA_TEST_PASSWORD is required for integration tests")
-
-	require.NoError(t, task.CreateLogin("integration", "", username, password, "", "", "", giteaURL, "", "", true, false, false, false))
-
-	login, err := config.GetLoginByName("integration")
-	require.NoError(t, err)
-	require.NotNil(t, login)
-
-	return login
-}
-
 func TestCreateRepoObjectFormat(t *testing.T) {
-	giteaURL := os.Getenv("GITEA_TEA_TEST_URL")
-	if giteaURL == "" {
-		t.Skip("GITEA_TEA_TEST_URL is not set, skipping test")
-	}
-
-	login := createIntegrationLogin(t, giteaURL)
+	login := createIntegrationLogin(t)
 	client := login.Client()
 	timestamp := time.Now().Unix()