Add container templates and installers for apps

Add new ProxmoxVED container templates (ct/*.sh), install scripts (install/*.sh) and metadata (json/*.json) for multiple applications: Akaunting, Blinko, Certimate, Dagu, Gogs, InvoiceShelf, Matomo, Papermark, RSS-Bridge, SolidTime and WhoDB. Each ct script includes update logic and deployment helpers; install scripts handle dependency installation, service creation (systemd), DB setup, and Caddy/PHP/Node/Postgres configuration where applicable. JSON entries provide UI metadata, resource defaults and access ports for each app.

json/rss-bridge.json

@@ -0,0 +1,35 @@
+{
+    "name": "RSS-Bridge",
+    "slug": "rss-bridge",
+    "categories": [
+        0
+    ],
+    "date_created": "2026-07-13",
+    "type": "ct",
+    "updateable": true,
+    "privileged": false,
+    "interface_port": 80,
+    "documentation": "https://rss-bridge.github.io/rss-bridge/",
+    "website": "https://rss-bridge.org/",
+    "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/rss-bridge.webp",
+    "config_path": "/opt/rss-bridge/config.ini.php",
+    "description": "RSS-Bridge is a PHP web application that generates web feeds for websites that don't have one, supporting over 400 bridges for various platforms and services.",
+    "install_methods": [
+        {
+            "type": "default",
+            "script": "ct/rss-bridge.sh",
+            "resources": {
+                "cpu": 1,
+                "ram": 512,
+                "hdd": 2,
+                "os": "Debian",
+                "version": "13"
+            }
+        }
+    ],
+    "default_credentials": {
+        "username": null,
+        "password": null
+    },
+    "notes": []
+}