feat(ihk): add complete AP2 courses for FIAE, FIDP, and FIDV (ZPA 2. Auflage)
- Added ihk_ap2_fiae (Anwendungsentwicklung: 12 modules, 4 tracks, Clean Architecture, GoF, UML 2.5, SOLID, O-Notation, 80h-Project guide)
- Added ihk_ap2_fidp (Daten- & Prozessanalyse: 12 modules, 4 tracks, BPMN 2.0, ETL/CDC, Star Schema, ML-Evaluation, interactive confusion matrix calculator, 40h-Project guide)
- Added ihk_ap2_fidv (Digitale Vernetzung: 12 modules, 4 tracks, CPS/RAMI 4.0, IO-Link, Profinet, TSN, OPC UA/MQTT, 5G Campus, IEC 62443, interactive Purdue trainer, 40h-Project guide)
- Expanded authentic question bank to 207 questions with official ZPA expectation horizons
- Registered all courses in courses_manifest.js, it_ausbildungen_manifest.js, server.py routes, and dashboard.html with button-only navigation
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