feat: add repository webhook management (#798)

## Summary

This PR adds support for organization-level and global webhooks in the tea CLI tool.

## Changes Made

### Organization Webhooks
- Added `--org` flag to webhook commands to operate on organization-level webhooks
- Implemented full CRUD operations for org webhooks (create, list, update, delete)
- Extended TeaContext to support organization scope

### Global Webhooks
- Added `--global` flag with placeholder implementation
- Ready for when Gitea SDK adds global webhook API methods

### Technical Details
- Updated context handling to support org/global scopes
- Modified all webhook subcommands (create, list, update, delete)
- Maintained backward compatibility for repository webhooks
- Updated tests and documentation

## Usage Examples

```bash
# Repository webhooks (existing)
tea webhooks list
tea webhooks create https://example.com/hook --events push

# Organization webhooks (new)
tea webhooks list --org myorg
tea webhooks create https://example.com/hook --org myorg --events push,pull_request

# Global webhooks (future)
tea webhooks list --global
```

## Testing
- All existing tests pass
- Updated test expectations for new descriptions
- Manual testing of org webhook operations completed

Closes: webhook management feature request
Reviewed-on: https://gitea.com/gitea/tea/pulls/798
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Ross Golder <ross@golder.org>
Co-committed-by: Ross Golder <ross@golder.org>

cmd/webhooks/delete.go

@@ -0,0 +1,84 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package webhooks
+
+import (
+	stdctx "context"
+	"fmt"
+
+	"code.gitea.io/tea/cmd/flags"
+	"code.gitea.io/tea/modules/context"
+	"code.gitea.io/tea/modules/utils"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/urfave/cli/v3"
+)
+
+// CmdWebhooksDelete represents a sub command of webhooks to delete webhook
+var CmdWebhooksDelete = cli.Command{
+	Name:        "delete",
+	Aliases:     []string{"rm"},
+	Usage:       "Delete a webhook",
+	Description: "Delete a webhook by ID from repository, organization, or globally",
+	ArgsUsage:   "<webhook-id>",
+	Action:      runWebhooksDelete,
+	Flags: append([]cli.Flag{
+		&cli.BoolFlag{
+			Name:    "confirm",
+			Aliases: []string{"y"},
+			Usage:   "confirm deletion without prompting",
+		},
+	}, flags.AllDefaultFlags...),
+}
+
+func runWebhooksDelete(ctx stdctx.Context, cmd *cli.Command) error {
+	if cmd.Args().Len() == 0 {
+		return fmt.Errorf("webhook ID is required")
+	}
+
+	c := context.InitCommand(cmd)
+	client := c.Login.Client()
+
+	webhookID, err := utils.ArgToIndex(cmd.Args().First())
+	if err != nil {
+		return err
+	}
+
+	// Get webhook details first to show what we're deleting
+	var hook *gitea.Hook
+	if c.IsGlobal {
+		return fmt.Errorf("global webhooks not yet supported in this version")
+	} else if len(c.Org) > 0 {
+		hook, _, err = client.GetOrgHook(c.Org, int64(webhookID))
+	} else {
+		hook, _, err = client.GetRepoHook(c.Owner, c.Repo, int64(webhookID))
+	}
+	if err != nil {
+		return err
+	}
+
+	if !cmd.Bool("confirm") {
+		fmt.Printf("Are you sure you want to delete webhook %d (%s)? [y/N] ", hook.ID, hook.Config["url"])
+		var response string
+		fmt.Scanln(&response)
+		if response != "y" && response != "Y" && response != "yes" {
+			fmt.Println("Deletion cancelled.")
+			return nil
+		}
+	}
+
+	if c.IsGlobal {
+		return fmt.Errorf("global webhooks not yet supported in this version")
+	} else if len(c.Org) > 0 {
+		_, err = client.DeleteOrgHook(c.Org, int64(webhookID))
+	} else {
+		_, err = client.DeleteRepoHook(c.Owner, c.Repo, int64(webhookID))
+	}
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("Webhook %d deleted successfully\n", webhookID)
+	return nil
+}