(feat/deep-research) Alpha implementation of deep research (#1202)

* Nick:

* Revert "fix(v1/types): fix extract -> json rename (FIR-1072) (#1195)"

This reverts commit 586a10f40d.

* Update deep-research-service.ts

* Nick:

* Nick:

* Nick:

* Nick:

* Nick:

* Nick:

* Update deep-research-service.ts

* Nick:

* Update deep-research-service.ts

* Apply suggestions from code review

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Co-authored-by: Gergő Móricz <mo.geryy@gmail.com>

apps/api/src/lib/llm/generate.ts

@@ -0,0 +1,33 @@
+import OpenAI from "openai";
+
+const openai = new OpenAI({
+  apiKey: process.env.OPENAI_API_KEY,
+});
+
+interface Message {
+  role: "system" | "user" | "assistant";
+  content: string;
+}
+
+interface GenerateTextOptions {
+  model: string;
+  messages: Message[];
+  temperature?: number;
+  maxTokens?: number;
+}
+
+export async function generateText(options: GenerateTextOptions) {
+  const { model, messages, temperature = 0.7, maxTokens } = options;
+
+  const completion = await openai.chat.completions.create({
+    model,
+    messages,
+    temperature,
+    max_tokens: maxTokens,
+  });
+
+  return {
+    text: completion.choices[0].message.content || "",
+    usage: completion.usage,
+  };
+}