docs: add backend setup and IoT sensor setup guides (closes #5)

docs/backend_setup.md

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+# Backend Setup Guide
+
+This guide covers setting up the LifeLine-ICT FastAPI backend locally.
+
+## Prerequisites
+
+- Python 3.11+
+- pip
+
+## Installation
+
+```bash
+cd backend
+python -m venv .venv
+source .venv/bin/activate        # Windows: .venv\Scripts\activate
+pip install -r requirements.txt
+```
+
+## Running the API
+
+```bash
+uvicorn backend.app.main:app --reload
+```
+
+API available at: `http://127.0.0.1:8000`
+Swagger docs at: `http://127.0.0.1:8000/docs`
+
+## Database Migrations
+
+```bash
+alembic upgrade head
+```
+
+## Running Tests
+
+```bash
+pytest backend/tests
+```
+
+## API Endpoints
+
+| Method | Endpoint                        | Description                  |
+|--------|---------------------------------|------------------------------|
+| GET    | /api/v1/projects                | List all ICT projects        |
+| POST   | /api/v1/projects                | Create a new project         |
+| GET    | /api/v1/projects/{id}           | Get project by ID            |
+| PUT    | /api/v1/projects/{id}           | Update a project             |
+| DELETE | /api/v1/projects/{id}           | Delete a project             |
+| GET    | /api/v1/resources               | List all ICT resources       |
+| POST   | /api/v1/resources               | Create a new resource        |
+| GET    | /api/v1/locations               | List all locations           |
+| POST   | /api/v1/locations               | Create a location            |
+| GET    | /api/v1/maintenance-tickets     | List maintenance tickets     |
+| POST   | /api/v1/maintenance-tickets     | Create a maintenance ticket  |
+| GET    | /api/v1/sensor-sites            | List IoT sensor sites        |
+| POST   | /api/v1/sensor-sites            | Create a sensor site         |
+
+## Business Rules
+
+- A resource **cannot be deleted** while it has open maintenance tickets
+- Closing a ticket **requires** a resolution note
+- Sensor sites must be linked to an existing resource and location

docs/iot_setup.md

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+# IoT Sensor Setup Guide
+
+This guide covers setting up the ESP32 sensor nodes and the Flask logging service.
+
+## Flask Logger Setup
+
+```bash
+cd iot/logging
+python -m venv .venv
+source .venv/bin/activate
+pip install flask
+python app.py
+```
+
+Logger runs at: `http://0.0.0.0:5000`
+
+## Endpoints
+
+| Method | Endpoint  | Description                  |
+|--------|-----------|------------------------------|
+| POST   | /log      | Receive sensor telemetry     |
+| GET    | /health   | Check logger status          |
+| GET    | /logs     | View recent log entries      |
+
+## Sending Data from ESP32
+
+Configure your ESP32 sketch with:
+```cpp
+const char* serverUrl = "http://YOUR-SERVER-IP:5000/log";
+```
+
+## Sample Payload
+
+```json
+{
+  "sensor_id": "ESP32-001",
+  "temperature": 24.5,
+  "humidity": 68.2,
+  "flood_level": 12.3,
+  "timestamp": "2026-04-21T10:30:00Z"
+}
+```
+
+## Data Storage
+
+Telemetry is stored in SQLite at `iot/logging/telemetry.db`