feat: add certs and proxy config to bru.sendRequest API (#6988)

* feat: add certs and proxy config to bru.sendRequest API

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: handle URL string argument in bru.sendRequest

When bru.sendRequest is called with a plain URL string instead of a
config object, the function now normalizes it to { url: string } before
processing. This fixes the case where spreading a string created an
invalid config object.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* feat: add variable interpolation to bru.sendRequest certs and proxy config

Interpolate environment variables in clientCertificates and proxy
configuration for bru.sendRequest API, enabling use of variables like
{{CERT_PATH}} or {{PROXY_HOST}} in certificate paths and proxy settings.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* refactor: use interpolateObject for certs and proxy config interpolation

- Add interpolateObject to electron's interpolate-string.js using
  buildCombinedVars pattern (matches CLI implementation)
- Simplify cert-utils.js by using interpolateObject instead of
  manual field-by-field interpolation
- Add interpolation for clientCertificates and proxy config in CLI's
  run-single-request.js for bru.sendRequest

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* refactor: add all variable types to sendRequest interpolation options

- Add globalEnvVars, collectionVariables, folderVariables, requestVariables
  to sendRequestInterpolationOptions for complete variable support
- Use cached system proxy instead of redundant getSystemProxy() call
- Remove duplicate getOptions() call

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* refactor: skip CA cert loading when TLS verification is disabled

Only load CA certificates when shouldVerifyTls is true, since they
are not used for validation when TLS verification is disabled.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

packages/bruno-cli/src/runner/run-single-request.js

@@ -170,6 +170,37 @@ const runSingleRequest = async function (
     const scriptingConfig = get(brunoConfig, 'scripts', {});
     scriptingConfig.runtime = runtime;
 
+    // Build certsAndProxyConfig for bru.sendRequest
+    const options = getOptions();
+    const systemProxyConfig = options['cachedSystemProxy'];
+    const sendRequestInterpolationOptions = {
+      envVars: envVariables,
+      runtimeVariables,
+      processEnvVars,
+      globalEnvVars,
+      collectionVariables: request.collectionVariables || {},
+      folderVariables: request.folderVariables || {},
+      requestVariables: request.requestVariables || {}
+    };
+    const rawClientCertificates = get(brunoConfig, 'clientCertificates');
+    const rawProxyConfig = get(brunoConfig, 'proxy', {});
+    const certsAndProxyConfig = {
+      collectionPath,
+      options: {
+        noproxy: get(options, 'noproxy', false),
+        shouldVerifyTls: !get(options, 'insecure', false),
+        shouldUseCustomCaCertificate: !!options['cacert'],
+        customCaCertificateFilePath: options['cacert'],
+        shouldKeepDefaultCaCertificates: !options['ignoreTruststore']
+      },
+      clientCertificates: rawClientCertificates ? interpolateObject(rawClientCertificates, sendRequestInterpolationOptions) : undefined,
+      collectionLevelProxy: transformProxyConfig(interpolateObject(rawProxyConfig, sendRequestInterpolationOptions)),
+      systemProxyConfig
+    };
+
+    // Add certsAndProxyConfig to request object for bru.sendRequest
+    request.certsAndProxyConfig = certsAndProxyConfig;
+
     // run pre request script
     const requestScriptFile = get(request, 'script.req');
     const collectionName = collection?.brunoConfig?.name;
@@ -237,7 +268,6 @@ const runSingleRequest = async function (
       request.url = `http://${request.url}`;
     }
 
-    const options = getOptions();
     const insecure = get(options, 'insecure', false);
     const noproxy = get(options, 'noproxy', false);
     const cachedSystemProxy = get(options, 'cachedSystemProxy', null);