🔒 Fix Let's Encrypt ACME challenge for SSL certificates

- Add .well-known/ path exclusion in proxy_handler
- Prevent quoter from intercepting ACME challenge requests
- Fix CI/CD build without sudo access
- Add comprehensive SSL troubleshooting documentation

Resolves: SSL certificate generation failure for files.dscrs.site

Cargo.toml

@@ -8,6 +8,7 @@ futures = "0.3.30"
 serde_json = "1.0.143"
 actix-web = "4.11.0"
 actix-cors = "0.7.0"
+actix-files = "0.6.7"
 reqwest = { version = "0.12.23", features = ["json"] }
 sentry = { version = "0.42", features = ["tokio"] }
 uuid = { version = "1.18.0", features = ["v4"] }