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-drugbinder-demo/src/protein_encoder.rs

@@ -43,7 +43,7 @@ pub struct ProteinEncoder {
 
 impl ProteinEncoder {
     /// Create a new protein encoder.
-    #[must_use] 
+    #[must_use]
     pub fn new(config: ProteinEncoderConfig) -> Self {
         let aa_embeddings = AminoAcidEmbeddings::new(config.aa_dim);
         let positional_encoding = PositionalEncoding::new(config.hidden_dim, config.max_seq_len);
@@ -64,7 +64,7 @@ impl ProteinEncoder {
     }
 
     /// Encode a protein target.
-    #[must_use] 
+    #[must_use]
     pub fn encode(&self, protein: &ProteinTarget) -> ProteinEmbedding {
         // Encode sequence
         let seq_embedding = self.encode_sequence(&protein.sequence);