refactor: deduplicate filter plugins, extract helpers across codebase

Bug fixes:
- client: add error field to ApiResponse to avoid swallowing server errors
- args/config: fix list_format default mismatch (5 vs 7 columns)
- client: url-encode size param in set_item_size

Dedup - filter plugins:
- Extract count_option() and pattern_option() helpers, replace 7 identical options()
- Add #[derive(Clone)] to all filter structs; remove verbose clone_box() impls
- Simplify FilterChain clone() and impl Clone for Box<dyn FilterPlugin>
- Add filter_clone_box! macro for future use
- Fix doctest example missing clone_box

Dedup - server API:
- Extract spawn_body_reader() with LimitBehavior enum for body streaming
- Extract check_binary_content() helper
- Extract stream_with_offset_and_length() helper
- Extract generate_status() helper in status.rs
- Extract append_query_params() helper in client.rs

Dedup - other:
- Extract yaml_value_to_string() in meta_plugin/mod.rs
- Extract item_from_row() in db.rs
- Delete unused DisplayListItem struct

Misc:
- Remove duplicate doc comment in compression_service.rs

src/db.rs

@@ -2,7 +2,7 @@ use anyhow::{Context, Error, Result, anyhow};
 use chrono::prelude::*;
 use lazy_static::lazy_static;
 use log::*;
-use rusqlite::{Connection, OpenFlags, params};
+use rusqlite::{Connection, OpenFlags, Row, params};
 use rusqlite_migration::{M, Migrations};
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
@@ -112,6 +112,17 @@ pub struct Item {
     pub compression: String,
 }
 
+fn item_from_row(row: &Row) -> Result<Item> {
+    Ok(Item {
+        id: row.get(0)?,
+        ts: row.get(1)?,
+        uncompressed_size: row.get(2)?,
+        compressed_size: row.get(3)?,
+        closed: row.get(4)?,
+        compression: row.get(5)?,
+    })
+}
+
 /// Represents a tag associated with an item.
 ///
 /// Defines the relationship between items and tags in a many-to-many structure.
@@ -852,15 +863,7 @@ pub fn query_all_items(conn: &Connection) -> Result<Vec<Item>> {
     let mut items = Vec::new();
 
     while let Some(row) = rows.next()? {
-        let item = Item {
-            id: row.get(0)?,
-            ts: row.get(1)?,
-            uncompressed_size: row.get(2)?,
-            compressed_size: row.get(3)?,
-            closed: row.get(4)?,
-            compression: row.get(5)?,
-        };
-        items.push(item);
+        items.push(item_from_row(row)?);
     }
 
     Ok(items)
@@ -931,15 +934,7 @@ pub fn query_tagged_items<'a>(conn: &'a Connection, tags: &'a Vec<String>) -> Re
     let mut items = Vec::new();
 
     while let Some(row) = rows.next()? {
-        let item = Item {
-            id: row.get(0)?,
-            ts: row.get(1)?,
-            uncompressed_size: row.get(2)?,
-            compressed_size: row.get(3)?,
-            closed: row.get(4)?,
-            compression: row.get(5)?,
-        };
-        items.push(item);
+        items.push(item_from_row(row)?);
     }
 
     Ok(items)