feat: Completely redesign Infrastructure IQ page with 8-section structure

- Hero section: 'The Brain for the Net-Zero Building' with 3D building visualization including Zigbee mesh and flexibility envelope curve
- Pain point section: Current state vs future state comparison (hammer approach vs predictive intelligence)
- Three pillars: Predict (24-48h forecasting), Connect (Zigbee mesh), Regulate (closed-loop control)
- Envelope technology USP section: Interactive flexibility corridor visualization
- Technical integration grid: Protocols (EEBUS, OpenADR, Modbus), hardware specs (DIN-Rail, Zigbee 3.0), compliance standards (§14a EnWG, VDE-AR-N)
- Use cases: Grid operators, facility managers, aggregators/VPPs
- Trust section: Whitepaper, testimonial, partner logos
- Final CTA: Contact engineering team for feasibility study

All sections include custom SVG icons and comprehensive CSS styling with responsive breakpoints

Author: eckelj