fix: version display, FileBrowser auto-login, nostr relay, UID mappings

Version per build:
- Health endpoint returns "1.2.0-alpha-{git_hash}" using GIT_HASH env
- CI passes git hash to cargo build

FileBrowser auto-login:
- filebrowser-client.ts: include CSRF token + credentials:include
- First-boot: generate random password, store at secrets/filebrowser/
- Set FileBrowser admin password to match after container creation

Nostr relay:
- Use docker.io/scsibug/nostr-rs-relay:0.9.0 (not in our registry)

UID mappings:
- Added electrumx (UID 1000), mysql-mempool, archy-btcpay-db, nextcloud-db

522 tests pass, Rust compiles clean.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

core/archipelago/src/api/rpc/dispatcher.rs

@@ -393,7 +393,7 @@ impl RpcHandler {
             "status": status,
             "crash_recovery_complete": recovery_complete,
             "uptime_seconds": uptime,
-            "version": env!("CARGO_PKG_VERSION"),
+            "version": format!("{}-{}", env!("CARGO_PKG_VERSION"), option_env!("GIT_HASH").unwrap_or("dev")),
         }))
     }
 }

core/archipelago/src/api/rpc/package/install.rs

@@ -452,11 +452,13 @@ impl RpcHandler {
     /// Default subuid start for archipelago user is 100000.
     fn mapped_uid(package_id: &str) -> u32 {
         let container_uid = match package_id {
-            "bitcoin-knots" | "bitcoin" => 101,
+            "bitcoin-knots" | "bitcoin" | "bitcoin-core" => 101,
             "grafana" => 472,
             "lnd" => 1000,
-            "mariadb" | "mysql" => 999,
-            "postgres" | "btcpay-postgres" | "immich-postgres" | "penpot-postgres" => 70,
+            "mariadb" | "mysql" | "mysql-mempool" | "archy-mempool-db" => 999,
+            "postgres" | "btcpay-postgres" | "immich-postgres" | "penpot-postgres"
+            | "archy-btcpay-db" | "nextcloud-db" => 70,
+            "electrumx" | "electrs" => 1000,
             _ => 0, // Most containers run as root (UID 0)
         };
         100000 + container_uid