docs: Add new CurseForge Modpack Version Checker API key

WHAT:
- Added second approved CurseForge API key
- Modpack Version Checker application approved
- Email confirmation received April 2, 2026 8:22 AM
- Documented key separation by use case

API KEYS:
- Primary (general): f865f951-b937-482d-860b-e950bd02bbd2
- Modpack Checker: $2a$10$OVK9ml7bEJdcfTJhBSuK1O5AFz2qq3mwpb35RTTwVfmdvzQFOA7M

RECOMMENDATION:
Use Modpack Version Checker key specifically for automated
version checking scripts to separate usage tracking.

REFERENCE:
Email from CurseForge API <api@curseforge.com>
Subject: Your CurseForge API Application - Approved
Application: Firefrost Modpack Version Checker

STATUS: Both keys approved and documented

Signed-off-by: Chronicler #55 <claude@firefrostgaming.com>

docs/tools/curseforge-api-integration.md

@@ -8,11 +8,27 @@
 
 ## 🔑 API Credentials
 
-**API Key:** `f865f951-b937-482d-860b-e950bd02bbd2`
+**Primary API Key (General Use):**
+```
+f865f951-b937-482d-860b-e950bd02bbd2
+```
+- Application: Firefrost Gaming CurseForge Integration
+- Status: Approved
+
+**Modpack Version Checker API Key:**
+```
+$2a$10$OVK9ml7bEJdcfTJhBSuK1O5AFz2qq3mwpb35RTTwVfmdvzQFOA7M
+```
+- Application: Firefrost Modpack Version Checker (3rd Party API)
+- Status: Approved April 2, 2026
+- Email confirmation: Received 8:22 AM
+- Use case: Automated modpack version checking for server updates
 
 **Authentication Methods:**
-1. Header: `X-Api-Token: f865f951-b937-482d-860b-e950bd02bbd2`
-2. Query param: `?token=f865f951-b937-482d-860b-e950bd02bbd2`
+1. Header: `X-Api-Token: [API_KEY]`
+2. Query param: `?token=[API_KEY]`
+
+**Recommendation:** Use the Modpack Version Checker key for automated version checking scripts to keep usage separated by purpose.
 
 **Base URL:** `https://minecraft.curseforge.com/api`