feat: optimize ag and apt snippet collections

AG (The Silver Searcher):
- Remove old snippets (5 removed)
- Add comprehensive search commands (38 added)
- Cover: search modes, output formats, file types, filters

APT (Debian/Ubuntu package manager):
- Remove old snippets (10 removed)
- Add comprehensive package commands (36 added)
- Cover: update/upgrade, install/remove, search, sources, dependencies

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Alfred.alfredpreferences/snippets/ag/ag -i 關鍵字 [C3D4E5F6-0A7B-9C0D-1E2F-3A4B5C6D7E8F].json

@@ -0,0 +1,8 @@
+{
+  "alfredsnippet" : {
+    "snippet" : "ag -i \"\"",
+    "uid" : "C3D4E5F6-0A7B-9C0D-1E2F-3A4B5C6D7E8F",
+    "name" : "搜尋關鍵字 (忽略大小寫)",
+    "keyword" : ""
+  }
+}