fix: Add API Key Validation to ThinkingReplayService

[zaibamachhaliya]

🔍 Issue

Fixes #2051 - ThinkingReplayService Crashes When OPENAI_API_KEY is Missing

✅ What's Changed

Problem

ThinkingReplayService initializes OpenAI client without validating if OPENAI_API_KEY exists in environment variables. When the key is missing, the service crashes with cryptic errors causing the entire application to fail.

Solution

Added API key validation in the constructor with clear error message.

Changes

• Added OPENAI_API_KEY validation in constructor
• Throw clear error: "OPENAI_API_KEY is required. Please set it in .env file."
• Added console.error for debugging
• Service now fails gracefully with meaningful error

Code Changes

constructor() {
  if (!process.env.OPENAI_API_KEY) {
    console.error('OPENAI_API_KEY is missing from environment variables.');
    throw new Error('OPENAI_API_KEY is required. Please set it in .env file.');
  }

  this.openai = new OpenAI({
    apiKey: process.env.OPENAI_API_KEY
  });
}

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📥 Commits

Reviewing files that changed from the base of the PR and between f785512 and 3b51c43.

📒 Files selected for processing (1)

• backend/services/thinkingReplayService.js

✨ Finishing Touches

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[zaibamachhaliya]

Hi @Eshajha19 please review my pr