Revert CLI arg quoting — spawn args array handles escaping

Node spawn with args array passes values directly to the process
without shell interpretation. Adding double quotes caused FireSTARR
to receive literal quote characters, breaking argument parsing.

Author: spydmobile

backend/src/infrastructure/firestarr/FireSTARREngine.ts

@@ -685,7 +685,7 @@ export class FireSTARREngine implements IFireModelingEngine {
       longitude.toString(),
       params.startTime,
       '--tz', utcOffset.toString(),
-      '--wx', `"${weatherFile}"`,
+      '--wx', weatherFile,
       '--ffmc', params.previousFFMC.toString(),
       '--dmc', params.previousDMC.toString(),
       '--dc', params.previousDC.toString(),
@@ -699,17 +699,17 @@ export class FireSTARREngine implements IFireModelingEngine {
     if (inputResult.perimeterFile) {
       if (isBinaryMode()) {
         // Binary mode: use host path directly
-        args.push('--perim', `"${inputResult.perimeterFile}"`);
+        args.push('--perim', inputResult.perimeterFile);
       } else {
         // Docker mode: extract filename and build container path
         const perimeterFilename = inputResult.perimeterFile.split('/').pop();
         const containerPerimeterFile = `${workingDir}/${perimeterFilename}`;
-        args.push('--perim', `"${containerPerimeterFile}"`);
+        args.push('--perim', containerPerimeterFile);
       }
     }
 
     if (params.outputDateOffsets) {
-      args.push('--output_date_offsets', `"${JSON.stringify(params.outputDateOffsets)}"`);
+      args.push('--output_date_offsets', JSON.stringify(params.outputDateOffsets));
     }
 
     // Always include simulation area grids for output portability