Add log cleanup function (15-day deletion) and archive documentation

- Added cleanup_old_logs() function to app_v3_simplified.py
- Deletes log.txt if older than 15 days at app startup
- Sends notification to monitoring server when cleanup occurs
- Archived all legacy modules and documentation to oldcode/
- Updated device_info.txt with correct IP (192.168.1.104)
- All changes validated and tested

oldcode/led_module.py

@@ -0,0 +1,111 @@
+"""
+LED Control Module
+Provides LED control functionality using gpiozero for visual feedback
+
+Supports:
+- LED blink patterns (single, double, triple)
+- On/off control
+- Graceful fallback if GPIO is not available
+"""
+
+import logging
+import time
+
+# Try to import gpiozero, fallback to dummy if not available
+try:
+    from gpiozero import LED
+    GPIOZERO_AVAILABLE = True
+    logging.info("✓ gpiozero module available for LED control")
+except ImportError:
+    GPIOZERO_AVAILABLE = False
+    logging.warning("✗ gpiozero not available - LED control disabled")
+
+
+class DummyLED:
+    """Dummy LED class for systems without GPIO"""
+    def __init__(self, pin):
+        self.pin = pin
+    
+    def on(self):
+        logging.debug(f"[Dummy LED {self.pin}] ON")
+    
+    def off(self):
+        logging.debug(f"[Dummy LED {self.pin}] OFF")
+    
+    def blink(self, on_time=1, off_time=1, n=None, background=True):
+        logging.debug(f"[Dummy LED {self.pin}] BLINK")
+
+
+# Initialize LED on GPIO pin 23 (or use dummy if not available)
+try:
+    if GPIOZERO_AVAILABLE:
+        led = LED(23)
+        logging.info("✓ LED initialized on GPIO pin 23")
+    else:
+        led = DummyLED(23)
+        logging.info("Using dummy LED (GPIO not available)")
+except Exception as e:
+    logging.warning(f"Could not initialize LED: {e}, using dummy")
+    led = DummyLED(23)
+
+
+def led_on():
+    """Turn LED on"""
+    try:
+        led.on()
+        logging.debug("LED turned ON")
+    except Exception as e:
+        logging.debug(f"Could not turn LED on: {e}")
+
+
+def led_off():
+    """Turn LED off"""
+    try:
+        led.off()
+        logging.debug("LED turned OFF")
+    except Exception as e:
+        logging.debug(f"Could not turn LED off: {e}")
+
+
+def led_blink_pattern(blinks=3, duration=0.5):
+    """
+    Blink LED in a pattern
+    
+    Args:
+        blinks: Number of blinks
+        duration: On/off duration per blink in seconds
+    """
+    try:
+        logging.info(f"LED blink pattern: {blinks} blinks, {duration}s each")
+        for i in range(blinks):
+            led.on()
+            time.sleep(duration)
+            led.off()
+            time.sleep(duration)
+    except Exception as e:
+        logging.debug(f"Could not execute LED blink pattern: {e}")
+
+
+def led_blink_slow(blinks=3):
+    """Slow blink (1 second on/off)"""
+    led_blink_pattern(blinks, 1)
+
+
+def led_blink_fast(blinks=3):
+    """Fast blink (0.25 second on/off)"""
+    led_blink_pattern(blinks, 0.25)
+
+
+def led_startup_sequence():
+    """LED sequence on startup - 3 short blinks"""
+    led_blink_pattern(3, 0.5)
+
+
+def led_ready_sequence():
+    """LED sequence when system is ready - 2 long blinks"""
+    led_blink_pattern(2, 1)
+
+
+def led_error_sequence():
+    """LED sequence on error - rapid blinks"""
+    led_blink_pattern(5, 0.2)