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>

internal/app/diff_review_test.go

@@ -0,0 +1,46 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package app
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseDiffCommentsMapsAddedAndRemovedLines(t *testing.T) {
+	diff := `diff --git a/sample.go b/sample.go
+--- a/sample.go
++++ b/sample.go
+@@ -1,4 +1,5 @@
+ package sample
+-func old() {}
+# Prefer a clearer name
++func renamed() {}
+ context
+# Keep context notes on the left
+`
+	comments, err := parseDiffComments(strings.NewReader(diff))
+	require.NoError(t, err)
+	require.Len(t, comments, 2)
+	require.Equal(t, "sample.go", comments[0].Path)
+	require.Equal(t, "Prefer a clearer name", comments[0].Body)
+	require.EqualValues(t, 2, comments[0].OldLine)
+	require.Zero(t, comments[0].NewLine)
+	require.Equal(t, "sample.go", comments[1].Path)
+	require.Equal(t, "Keep context notes on the left", comments[1].Body)
+	require.EqualValues(t, 3, comments[1].OldLine)
+	require.Zero(t, comments[1].NewLine)
+}
+
+func TestSaveDiffReviewIncludesHelpHeader(t *testing.T) {
+	path, err := saveDiffReview(t.TempDir(), 7, "owner/repo", strings.NewReader("diff --git a/x b/x\n"))
+	require.NoError(t, err)
+	data, err := os.ReadFile(path)
+	require.NoError(t, err)
+	require.Contains(t, string(data), "PR #7 on owner/repo")
+	require.Contains(t, string(data), "diff --git a/x b/x")
+}