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 -L 關鍵字 [F6A7B8C9-3D0E-2F3A-4B5C-6D7E8F9A0B1C].json

@@ -0,0 +1,8 @@
+{
+  "alfredsnippet" : {
+    "snippet" : "ag -L \"\"",
+    "uid" : "F6A7B8C9-3D0E-2F3A-4B5C-6D7E8F9A0B1C",
+    "name" : "只列出不含關鍵字的檔案名稱",
+    "keyword" : ""
+  }
+}