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/deadline_test.go

@@ -0,0 +1,50 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package app
+
+import (
+	"context"
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestDeadlineInputAndExplicitClearing(t *testing.T) {
+	for _, family := range []string{"issue", "pr"} {
+		for _, tc := range []struct{ value, payload string }{
+			{"2028-01-15", `{"due_date":"2028-01-15T00:00:00Z"}`},
+			{"2028-01-15T00:30:00+02:00", `{"due_date":"2028-01-15T00:30:00+02:00"}`},
+			{"01/15/2028", `{"due_date":"2028-01-15T00:00:00Z"}`},
+			{"1704067200000", `{"due_date":"2024-01-01T00:00:00Z"}`},
+			{"1704067200", `{"due_date":"2024-01-01T00:00:00Z"}`},
+			{"", `{"unset_due_date":true}`},
+		} {
+			t.Run(family+"/"+tc.value, func(t *testing.T) {
+				server := newAuthenticatedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+					require.Equal(t, http.MethodPatch, r.Method)
+					collection := "issues"
+					if family == "pr" {
+						collection = "pulls"
+					}
+					require.Equal(t, "/api/v1/repos/owner/repo/"+collection+"/1", r.URL.Path)
+					requirePayload(t, tc.payload, r.Body)
+					_, _ = w.Write([]byte(`{"number":1,"due_date":null}`))
+				}))
+				defer server.Close()
+				deps, out, _ := serverDeps(t, server.URL)
+				require.NoError(t, Execute(context.Background(), deps, []string{family, "edit", "1", "-R", "owner/repo", "--deadline=" + tc.value, "--json=number,due_date"}))
+				require.JSONEq(t, `{"number":1,"due_date":null}`, out.String())
+			})
+		}
+	}
+}
+
+func TestInvalidDeadlineBeforeInputCollectionOrNetwork(t *testing.T) {
+	for _, value := range []string{"bad", "2026-02-30", "0", "not-a-timestamp", "999999999999999999999999999999999999"} {
+		for _, command := range [][]string{{"issue", "edit", "1"}, {"pr", "edit", "1", "--add-reviewers=alice"}, {"issue", "create"}, {"pr", "create"}} {
+			requireUsageBeforeRequests(t, "invalid --deadline", append(command, "--deadline="+value)...)
+		}
+	}
+}