Design a Bluetooth-Controlled 12V Relay Circuit Module

I need a compact and efficient circuit module designed to operate a 12V relay using Bluetooth. The circuit should allow a user to control the relay via a smartphone app (preferably using Bluetooth Low Energy). Here are the requirements:
1. Components:
• 12V relay module.
• Bluetooth module (e.g., HC-05, HC-06, or BLE modules like HM-10/ESP32).
• Microcontroller (if required, e.g., Arduino Nano, ESP32, or ATmega328).
• Voltage regulator for powering the module from a 12V DC source.
• Required resistors, transistors, diodes, and capacitors for relay operation.
2. Functional Requirements:
• The relay should toggle (ON/OFF) based on commands received via Bluetooth.
• The circuit should include protection features (e.g., flyback diode for the relay).
• LED indicators for power, Bluetooth connection, and relay status.
3. Power Supply:
• Operates on a 12V DC input (single power source for the relay and circuit).
4. App Compatibility:
• Should work with common Bluetooth terminal apps or a custom app (if proposed).
5. Deliverables:
• Circuit diagram (schematic) in standard format (e.g., PDF or CAD).
• Component list (BOM) with detailed specifications.
• PCB design (preferred).
• Basic instructions for usage and pairing with a smartphone.