docs: v3.3.3 BT tether parity — phone_mac, internet probe, route check
Add BT Tethering guide + sync phone-initiated pairing docs Changes from docs/wiki/ source of truth: - BT-Tethering.md (new): 184-line step-by-step user guide for phone-initiated BT tethering. Phone-side prerequisites, per-OS pairing steps (Android stock/OneUI/MIUI/iOS), confirmation checklist, error-hint reference table, per-phone quirks section, FAQ. - Home.md: add the new guide to the "New Here?" section so new users find it immediately. - Bluetooth.md: link to the dedicated guide at the top of the Tethering section; existing page keeps its pentest/attacks focus. - Getting-Started.md: update the BT setup step to match the new phone-initiated flow (no web UI Scan button anymore). - Troubleshooting-and-FAQ.md: add FAQ entry for USB-vs-BT internet explaining that USB is a PC-only point-to-point link and needs ICS/Internet Sharing to route to the wider internet. - Web-Dashboard.md: update Phone Tethering card row description.