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/apt/apt update [A1B2C3D4-5E6F-7A8B-9C0D-1E2F3A4B5C6D].json

@@ -0,0 +1,8 @@
+{
+  "alfredsnippet" : {
+    "snippet" : "sudo apt update",
+    "uid" : "A1B2C3D4-5E6F-7A8B-9C0D-1E2F3A4B5C6D",
+    "name" : "更新套件清單",
+    "keyword" : ""
+  }
+}