feat: add convenience methods to filter service and improve filter chain processing

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/services/filter_service.rs

@@ -31,4 +31,29 @@ impl FilterService {
             Ok(Vec::new())
         }
     }
+
+    // Add a method to process data through the filter chain and handle finish automatically
+    pub fn process_all_data(&self, chain: &mut Option<FilterChain>, data: &[u8]) -> Result<Vec<u8>> {
+        let mut processed = if let Some(chain) = chain {
+            chain.process(data)?
+        } else {
+            data.to_vec()
+        };
+        
+        // If we have a chain, also get any remaining data from finish()
+        if chain.is_some() {
+            let finished = self.finish_processing(chain)?;
+            if !finished.is_empty() {
+                processed.extend(finished);
+            }
+        }
+        
+        Ok(processed)
+    }
+
+    // Helper method to create and process data with a filter string in one call
+    pub fn process_with_filter(&self, data: &[u8], filter_str: Option<&str>) -> Result<Vec<u8>> {
+        let mut chain = self.create_filter_chain(filter_str)?;
+        self.process_all_data(&mut chain, data)
+    }
 }