refactor: move config_path from root into install_methods

Migrated all 80 app JSON files to place config_path inside each
install_methods object instead of at the root level. This allows
different install methods (e.g. Debian vs Alpine) to have distinct
config paths.

Also updated AGENTS.md JSON structure example to reflect the change.

json/fireshare.json

@@ -12,12 +12,12 @@
   "documentation": "https://github.com/ShaneIsrael/fireshare/blob/develop/README.md",
   "website": "https://github.com/ShaneIsrael/fireshare",
   "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/fireshare.webp",
-  "config_path": "/opt/fireshare/fireshare.env",
   "description": "Fireshare is a self-hosted app that lets you share videos — particularly gaming clips — via unique links. You upload videos to a folder, and the app generates shareable URLs for each one. It's designed as a lightweight alternative to services like Medal or YouTube for people who want full control over their content without relying on third-party platforms.",
   "install_methods": [
     {
       "type": "default",
       "script": "ct/fireshare.sh",
+      "config_path": "/opt/fireshare/fireshare.env",
       "resources": {
         "cpu": 2,
         "ram": 2048,
@@ -45,4 +45,4 @@
       "type": "warning"
     }
   ]
-}
+}