refactor: tool plugin registry - each tool in separate file

lib/tools/_http.ts

@@ -0,0 +1,54 @@
+/**
+ * Shared HTTP helpers for tool executors.
+ * Calls loopback tablet API routes with Bearer + x-voice-internal headers.
+ */
+
+export class ToolHttpError extends Error {
+  constructor(public status: number, public body: string) {
+    super(`tool_http_${status}`)
+  }
+}
+
+const baseUrl = () => `http://localhost:${process.env.PORT || '3000'}`
+
+export function headers(): Record<string, string> {
+  const key = process.env.VOICE_API_KEY || ''
+  return {
+    Authorization: `Bearer ${key}`,
+    'x-voice-internal': key,
+    'Content-Type': 'application/json',
+  }
+}
+
+export async function tabletGet(path: string, params?: Record<string, string>): Promise<any> {
+  const url = new URL(`${baseUrl()}${path}`)
+  if (params) {
+    for (const [k, v] of Object.entries(params)) {
+      if (v !== undefined && v !== '') url.searchParams.set(k, v)
+    }
+  }
+  const r = await fetch(url, { headers: headers(), cache: 'no-store' })
+  if (!r.ok) throw new ToolHttpError(r.status, await r.text().catch(() => ''))
+  return r.json()
+}
+
+export async function tabletJson(
+  method: 'POST' | 'PUT' | 'DELETE',
+  path: string,
+  body?: any,
+  params?: Record<string, string>,
+): Promise<any> {
+  const url = new URL(`${baseUrl()}${path}`)
+  if (params) {
+    for (const [k, v] of Object.entries(params)) {
+      if (v !== undefined && v !== '') url.searchParams.set(k, v)
+    }
+  }
+  const r = await fetch(url, {
+    method,
+    headers: headers(),
+    body: body !== undefined ? JSON.stringify(body) : undefined,
+  })
+  if (!r.ok) throw new ToolHttpError(r.status, await r.text().catch(() => ''))
+  return r.json()
+}