Add Bluetooth Bridge (bluetooth_bridge) app

[excitoon]

Application Submission

Bluetooth Bridge for Flipper Zero — wirelessly bridges BLE serial (phone) to GPIO UART, enabling remote control of serial devices like ESP32 Marauder, GPS modules, and other UART peripherals directly from a phone.

Features:

• Bridges BLE serial ↔ GPIO UART (USART1, 115200 8N1)
• Live byte counter on screen
• Battery level reporting via BLE Battery Service
• OTA self-update over BLE (no USB needed to update the app)
• One-time pairing, stored permanently

Extra Requirements

Requires a UART device connected to Flipper GPIO (pins 13/14, TX/RX). Tested with ESP32 running Marauder firmware.

Author Checklist (Fill this out)

• I've read the contribution guidelines and my PR follows them
• I own the code I'm submitting or have code owner's permission to submit it
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have validated the manifest file(s) with python3 tools/bundle.py --nolint applications/CATEGORY/APPID/manifest.yml bundle.zip

AI usage disclosure (Fill this out):

• Partially AI assisted (clarify below which code was AI assisted and briefly explain what it does).
• Fully AI generated (explain what all the generated code does in moderate detail).

AI assisted with CI/CD workflow, screenshot generation, and catalog manifest. Core application logic written by the author.

Reviewer Checklist (Don't fill this out!)

• Bundle is valid
• There are no obvious issues with the source code
• I've ran this application and verified its functionality

[xMasterX]

Hi, you are trying to include file that does not exist
fatal error: commit_hash.h: No such file or directory
Remove line 30 from your main .c code and update commit sha here