rc_society dashboard display (#131)

### Description

Closes #130

### Please confirm

- [x] I am the legal owner or represent the legal owner of all work submitted (including LLM-generated code, if any)
- [x] I consent to my changes being added to this FOSS project
- [x] I have confirmed that this does not add new errors or warnings with `utils/clippy.sh`
- [ ] This PR used LLMs to generate some or all of the code changes

Reviewed-on: https://git.ngram.ca/OpenJam/rc-servers/pulls/131

rc_core/src/persist/config/traits.rs

@@ -100,6 +100,7 @@ pub struct ServerConfig {
     pub cdn_url: String,
     pub auth_url: String,
     pub intercom_url: String,
+    pub factory_url: String,
     pub minimum_version: i32,
     pub dos_protect: bool,
     pub maintenance_message: Option<String>,