feat!: rebuild tea on Cobra with explicit noun/verb commands (#1126)

- **switch tea to the Cobra command tree:** `internal/app` wires the packages from parts 1–4 into explicit noun/verb commands with `--repo`, `--json` / `--jq`, `--sudo` and `--debug`; `main.go` points at it. Build, release and docs tooling (`tools/cli-docs`, Makefile, goreleaser, snap, CI) and README / CONTRIBUTING are updated.
- **remove the urfave/cli command tree:** deletes `cmd/`, `modules/`, the old integration tests, contrib completion scripts and the generated `docs/CLI.md`, and drops their dependencies. This commit only deletes.

## Breaking changes

This is a breaking release. It requires Gitea 28 or newer; configuration moves to separate `config.yml` and `hosts.yml` files and requires fresh authentication, and command names, aliases, flags and output formats change. `docs/migration-1.0.md` maps every old command, flag and environment variable to its replacement.

## Issues

fixes #1118
fixes #1116
fixes #1115
fixes #1094
fixes #1091
fixes #1073
fixes #1052
fixes #1032
fixes #1023
fixes #966
fixes #908
fixes #833
fixes #831
fixes #817
fixes #804
fixes #779
fixes #770
fixes #737
fixes #697
fixes #726
fixes #677
fixes #672
fixes #633
fixes #632
fixes #560
fixes #556
fixes #523
fixes #516
fixes #510
fixes #504
fixes #500
fixes #482
fixes #406
fixes #403
fixes #373
fixes #351
fixes #344
fixes #326
fixes #325
fixes #323
fixes #246
fixes #240
fixes #232
fixes #197
fixes #172
fixes #141
fixes #69
fixes #1110
fixes #569
fixes #480
fixes #666
fixes #670
fixes #457
fixes #643
fixes #498
fixes #490
fixes #1069
fixes #834
fixes #602
fixes #328
fixes #417
fixes #571
fixes #1029
fixes #489
fixes #1050
fixes #162
fixes #430
fixes #1087
fixes #683

Reviewed-on: https://gitea.com/gitea/tea/pulls/1126
Reviewed-by: TheFox0x7 <95654+thefox0x7@noreply.gitea.com>

modules/git/cli_backend_test.go

@@ -1,40 +0,0 @@
-// Copyright 2026 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package git
-
-import (
-	"os"
-	"path/filepath"
-	"runtime"
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-func TestOpenClassifiesLocalizedNotRepoError(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("test uses a POSIX shell script as fake git")
-	}
-
-	fakeGitDir := t.TempDir()
-	fakeGit := filepath.Join(fakeGitDir, "git")
-	script := `#!/bin/sh
-locale="${LC_ALL:-${LANG:-C}}"
-if [ "$locale" = "C" ]; then
-	echo "fatal: not a git repository (or any of the parent directories): .git" >&2
-else
-	echo "fatal: Kein Git-Repository (oder irgendein Elternverzeichnis bis zum Einhangepunkt /)" >&2
-fi
-exit 128
-`
-	require.NoError(t, os.WriteFile(fakeGit, []byte(script), 0o755))
-
-	t.Setenv("PATH", fakeGitDir+string(os.PathListSeparator)+os.Getenv("PATH"))
-	t.Setenv("LC_ALL", "de_DE.UTF-8")
-	t.Setenv("LANG", "de_DE.UTF-8")
-	t.Setenv("LANGUAGE", "de_DE:de")
-
-	_, err := (cliBackend{}).Open(t.TempDir())
-	require.ErrorIs(t, err, ErrRepositoryNotExists)
-}