feat: add PCARS 1 & 2 UDP telemetry parser (port 5606)

- Auto-detect PCARS1 (1367-byte V1) vs PCARS2 (559-byte V2) packet format
- Parse speed, RPM, gear, inputs, tyres, engine temps, damage, weather
- Map PCARS-specific fields to TelemetryFrame (oil/water temp, damage, etc.)
- Add FeedSource::Pcars + 16 PCARS-specific Option fields to TelemetryFrame
- Port 5606 as optional bind-listen feed (like Telemetry Tool)
- 5 new unit tests for PCARS parser (32 total)
- Shared binary_utils module for all parsers

src/telemetry_frame.rs

@@ -10,6 +10,7 @@ use std::fmt;
 pub enum FeedSource {
     Ksudp,
     TelemetryTool,
+    Pcars,
 }
 
 /// Per-wheel index convention: FL=0, FR=1, RL=2, RR=3.
@@ -106,6 +107,24 @@ pub struct TelemetryFrame {
     pub last_sector_times: Option<[i32; 3]>,
     pub driver_id: Option<u32>,
 
+    // ── PCARS-specific fields ──────────────────────────────────────
+    pub oil_temp_celsius: Option<i16>,
+    pub water_temp_celsius: Option<i16>,
+    pub fuel_capacity: Option<u8>,
+    pub boost_amount: Option<u8>,
+    pub crash_state: Option<u8>,
+    pub odometer_km: Option<f32>,
+    pub aero_damage: Option<u8>,
+    pub engine_damage: Option<u8>,
+    pub ambient_temperature: Option<i8>,
+    pub track_temperature: Option<i8>,
+    pub rain_density: Option<u8>,
+    pub track_length: Option<f32>,
+    pub full_position: Option<[f32; 3]>,
+    pub tyre_wear: Option<[u8; 4]>,
+    pub brake_temp_celsius: Option<[i16; 4]>,
+    pub suspension_damage: Option<[u8; 4]>,
+
     // ── Meta ───────────────────────────────────────────────────────
     pub source: FeedSource,
     pub raw_size: usize,
@@ -179,6 +198,22 @@ impl Default for TelemetryFrame {
             sector_times: None,
             last_sector_times: None,
             driver_id: None,
+            oil_temp_celsius: None,
+            water_temp_celsius: None,
+            fuel_capacity: None,
+            boost_amount: None,
+            crash_state: None,
+            odometer_km: None,
+            aero_damage: None,
+            engine_damage: None,
+            ambient_temperature: None,
+            track_temperature: None,
+            rain_density: None,
+            track_length: None,
+            full_position: None,
+            tyre_wear: None,
+            brake_temp_celsius: None,
+            suspension_damage: None,
             source: FeedSource::Ksudp,
             raw_size: 0,
         }
@@ -213,6 +248,7 @@ impl fmt::Display for FeedSource {
         match self {
             FeedSource::Ksudp => write!(f, "KSUDP"),
             FeedSource::TelemetryTool => write!(f, "Telemetry Tool"),
+            FeedSource::Pcars => write!(f, "PCARS"),
         }
     }
 }