feat: RTL_433 protocol database import - iteration 1/5

- Expanded protocol database from 18 → 299 signatures (16.6x increase)
- Imported 281 protocols from RTL_433 open-source database (286 total devices)
- Created automated import script: scripts/import_rtl433_protocols.py
- Generated rtl433_protocols_imported.py with timing/frequency/modulation data
- Updated protocol_database.py to include RTL433_PROTOCOLS
- All 26 tests passing

Breakdown by category:
  - Weather: 116 protocols
  - Sensors: 36 protocols
  - TPMS: 25 protocols
  - Security: 23 protocols
  - Home Automation: 18 protocols
  - Other: 50+ protocols

Frequency coverage:
  - 433.92 MHz: 248 protocols
  - 315.00 MHz: 32 protocols
  - 915.00 MHz: 1 protocol

This provides comprehensive coverage of Sub-GHz IoT devices for accurate
identification from raw RF captures.

src/matcher/protocol_database.py

@@ -312,6 +312,13 @@ REMOTE_CONTROLS = [
 ]
 
 
+# Import RTL_433 protocols
+try:
+    from src.matcher.rtl433_protocols_imported import RTL433_PROTOCOLS
+except ImportError:
+    print("Warning: RTL_433 protocols not imported yet. Run scripts/import_rtl433_protocols.py")
+    RTL433_PROTOCOLS = []
+
 # Compile all protocols into single list
 ALL_PROTOCOLS = (
     WEATHER_SENSORS +
@@ -319,7 +326,8 @@ ALL_PROTOCOLS = (
     DOORBELLS +
     TIRE_PRESSURE +
     SECURITY_SENSORS +
-    REMOTE_CONTROLS
+    REMOTE_CONTROLS +
+    RTL433_PROTOCOLS  # Imported from RTL_433 database
 )