style: apply rustfmt across all crates and demos

Consistent formatting pass: line wrapping, import sorting, trailing
whitespace removal, let-chain indentation, merged derive attributes,
and unsafe block reformatting.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

demos/rtx-tumorboard-demo/src/report_generator.rs

@@ -400,12 +400,13 @@ Multi-Modal Fusion:
         ));
 
         if let Some(assessment) = &fused.tumor_assessment
-            && let Some(tnm) = &assessment.tnm_stage {
-                impression.push_str(&format!(
-                    "2. Clinical stage: {} (T{}N{}M{})\n",
-                    tnm.overall_stage, tnm.t, tnm.n, tnm.m
-                ));
-            }
+            && let Some(tnm) = &assessment.tnm_stage
+        {
+            impression.push_str(&format!(
+                "2. Clinical stage: {} (T{}N{}M{})\n",
+                tnm.overall_stage, tnm.t, tnm.n, tnm.m
+            ));
+        }
 
         impression.push_str(&format!(
             "3. Overall analysis confidence: {:.0}%\n",