Remove all stall detection logic, add 100ms current logging

- Removed all STALL_* configuration parameters from config.h
- Simplified motor.h: removed stall-related methods and member variables
- Simplified motor.cpp: deleted checkStall(), resetStallDetection()
- Added frequent current logging (100ms) for data collection
- Removed stall callback system from main.cpp
- Simplified pingpong mode: time-based only, removed stall-return option
- Updated webserver: removed stall warning UI, removed stallReturn checkbox
- Updated status JSON: removed stalled and ppStallReturn fields

This version is for testing with new beefy PSU to collect current data
before designing new stall detection algorithm.

src/main.cpp

@@ -33,32 +33,18 @@ void setupWiFi() {
     }
 }
 
-// Stall protection callback - stops motor immediately when stall detected
-// (unless pingpong with stallReturn is active - it handles stall by switching direction)
-void onMotorStall(float current) {
-    if (motor.isPingpongActive() && motor.getPingpongStallReturn()) {
-        // Pingpong will handle stall by switching direction
-        Serial.printf("STALL DETECTED: Pingpong will switch direction (current: %.2fA)\n", current);
-        return;
-    }
-    Serial.printf("STALL PROTECTION: Stopping motor (current: %.2fA)\n", current);
-    motor.stop();
-}
-
 void setup() {
     Serial.begin(115200);
     delay(1000);
     
     Serial.println("\n=============================");
     Serial.println("  BTS7960 Motor Controller");
+    Serial.println("  (Stall Detection Removed)");
     Serial.println("=============================\n");
     
     // Initialize motor controller
     motor.begin();
     
-    // Register stall protection callback
-    motor.setStallCallback(onMotorStall);
-    
     // Connect to WiFi
     setupWiFi();
     
@@ -72,6 +58,6 @@ void setup() {
 
 void loop() {
     handleWebServer();
-    motor.update();  // Update current sensing and stall detection
+    motor.update();  // Update current sensing and logging
     delay(1);
 }