Add image adjustments pipeline (brightness, contrast, crop, effects)

pixstrip-core/src/pipeline.rs

@@ -14,6 +14,7 @@ pub struct ProcessingJob {
     pub resize: Option<ResizeConfig>,
     pub rotation: Option<Rotation>,
     pub flip: Option<Flip>,
+    pub adjustments: Option<AdjustmentsConfig>,
     pub convert: Option<ConvertConfig>,
     pub compress: Option<CompressConfig>,
     pub metadata: Option<MetadataConfig>,
@@ -31,6 +32,7 @@ impl ProcessingJob {
             resize: None,
             rotation: None,
             flip: None,
+            adjustments: None,
             convert: None,
             compress: None,
             metadata: None,
@@ -49,6 +51,7 @@ impl ProcessingJob {
         if self.resize.is_some() { count += 1; }
         if self.rotation.is_some() { count += 1; }
         if self.flip.is_some() { count += 1; }
+        if self.adjustments.as_ref().is_some_and(|a| !a.is_noop()) { count += 1; }
         if self.convert.is_some() { count += 1; }
         if self.compress.is_some() { count += 1; }
         if self.metadata.is_some() { count += 1; }