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>

modules/print/webhook.go

@@ -0,0 +1,82 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package print
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"code.gitea.io/sdk/gitea"
+)
+
+// WebhooksList prints a listing of webhooks
+func WebhooksList(hooks []*gitea.Hook, output string) {
+	t := tableWithHeader(
+		"ID",
+		"Type",
+		"URL",
+		"Events",
+		"Active",
+		"Updated",
+	)
+
+	for _, hook := range hooks {
+		var url string
+		if hook.Config != nil {
+			url = hook.Config["url"]
+		}
+
+		events := strings.Join(hook.Events, ",")
+		if len(events) > 40 {
+			events = events[:37] + "..."
+		}
+
+		active := "✓"
+		if !hook.Active {
+			active = "✗"
+		}
+
+		t.addRow(
+			strconv.FormatInt(hook.ID, 10),
+			string(hook.Type),
+			url,
+			events,
+			active,
+			FormatTime(hook.Updated, false),
+		)
+	}
+
+	t.print(output)
+}
+
+// WebhookDetails prints detailed information about a webhook
+func WebhookDetails(hook *gitea.Hook) {
+	fmt.Printf("# Webhook %d\n\n", hook.ID)
+	fmt.Printf("- **Type**: %s\n", hook.Type)
+	fmt.Printf("- **Active**: %t\n", hook.Active)
+	fmt.Printf("- **Created**: %s\n", FormatTime(hook.Created, false))
+	fmt.Printf("- **Updated**: %s\n", FormatTime(hook.Updated, false))
+
+	if hook.Config != nil {
+		fmt.Printf("- **URL**: %s\n", hook.Config["url"])
+		if contentType, ok := hook.Config["content_type"]; ok {
+			fmt.Printf("- **Content Type**: %s\n", contentType)
+		}
+		if method, ok := hook.Config["http_method"]; ok {
+			fmt.Printf("- **HTTP Method**: %s\n", method)
+		}
+		if branchFilter, ok := hook.Config["branch_filter"]; ok && branchFilter != "" {
+			fmt.Printf("- **Branch Filter**: %s\n", branchFilter)
+		}
+		if _, hasSecret := hook.Config["secret"]; hasSecret {
+			fmt.Printf("- **Secret**: (configured)\n")
+		}
+		if _, hasAuth := hook.Config["authorization_header"]; hasAuth {
+			fmt.Printf("- **Authorization Header**: (configured)\n")
+		}
+	}
+
+	fmt.Printf("- **Events**: %s\n", strings.Join(hook.Events, ", "))
+}