feat: add HTTP request tool for API interactions

Implements #210 - Add http_request tool that enables the agent to make
HTTP requests to external APIs.

Features:
- Supports GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS methods
- JSON request/response handling
- Configurable timeout (default: 30s)
- Configurable max response size (default: 1MB)
- Security: domain allowlist, blocks local/private IPs (SSRF protection)
- Headers support with auth token redaction

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/onboard/wizard.rs

@@ -105,6 +105,7 @@ pub fn run_wizard() -> Result<Config> {
         composio: composio_config,
         secrets: secrets_config,
         browser: BrowserConfig::default(),
+        http_request: crate::config::HttpRequestConfig::default(),
         identity: crate::config::IdentityConfig::default(),
         agents: std::collections::HashMap::new(),
     };
@@ -297,6 +298,7 @@ pub fn run_quick_setup(
         composio: ComposioConfig::default(),
         secrets: SecretsConfig::default(),
         browser: BrowserConfig::default(),
+        http_request: crate::config::HttpRequestConfig::default(),
         identity: crate::config::IdentityConfig::default(),
         agents: std::collections::HashMap::new(),
     };