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/doctor.go

@@ -0,0 +1,30 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package app
+
+import (
+	"fmt"
+
+	"gitea.dev/tea/internal/clierr"
+	"github.com/spf13/cobra"
+)
+
+func (a *application) doctorCommand() *cobra.Command {
+	return &cobra.Command{Use: "doctor", Short: "Inspect resolved instance and repository context", Args: argsExact(0), RunE: func(cmd *cobra.Command, _ []string) error {
+		// Repository discovery is best-effort: doctor must also work outside a clone.
+		// Only discovery (usage) failures fall back; authentication errors are reported.
+		target, err := a.resolve(cmd.Context(), true)
+		if clierr.ExitCode(err) == clierr.Usage && a.options.repo == "" && a.deps.Getenv("TEA_REPO") == "" {
+			target, err = a.resolve(cmd.Context(), false)
+		}
+		if err != nil {
+			return err
+		}
+		if a.options.json != "" {
+			return a.writeJSON(cmd, target)
+		}
+		_, err = fmt.Fprintf(cmd.OutOrStdout(), "instance\t%s\t%s\naccount\t%s\t%s\nrepository\t%s\t%s\n", target.Host, target.HostSource, target.User, target.UserSource, target.Repo, target.RepoSource)
+		return err
+	}}
+}