fix: resolve clippy warnings across all crates

- Remove inherent to_string() methods shadowing Display (Command, CommandArgument)
- Fix empty line after doc comment in shared/types.rs
- Use sort_by_key with Reverse instead of sort_by in config.rs
- Remove redundant closures in client.rs
- Fix borrow patterns in ephemeral.rs and keys.rs
- Use abs_diff in resend.rs
- Fix needless Ok/? in tsdb/config.rs
- Allow too_many_arguments for create_message in tsdb/message.rs
- Allow dead_code on placeholder tsaudio structs

src/tsaudio/src/capture.rs

@@ -2,6 +2,7 @@
 
 use super::{AudioConfig, AudioError, AudioFrame, AudioResult};
 
+#[allow(dead_code)]
 pub struct AudioCapture {
     config: AudioConfig,
 }

src/tsaudio/src/codec.rs

@@ -2,6 +2,7 @@
 
 use super::{AudioError, AudioResult};
 
+#[allow(dead_code)]
 pub struct OpusEncoder {
     sample_rate: u32,
     channels: u16,
@@ -24,6 +25,7 @@ impl OpusEncoder {
     }
 }
 
+#[allow(dead_code)]
 pub struct OpusDecoder {
     sample_rate: u32,
     channels: u16,

src/tsaudio/src/playback.rs

@@ -2,6 +2,7 @@
 
 use super::{AudioConfig, AudioFrame, AudioResult};
 
+#[allow(dead_code)]
 pub struct AudioPlayback {
     config: AudioConfig,
 }