fix(openwrt): close TollGate free-access gap and mint URL mismatch

Two bugs found live against archy-x250-pa3: TollGate-3458 (the upstream
tollgate-module-basic-go installer's own default AP, rebranded from
OpenWrt's factory default wireless.default_radioN sections) was left
bound to `network=lan` — wide open, unmetered, and sharing the router's
admin LAN — because install_ipk() runs the upstream package's own
uci-defaults scripts but nothing reconciled the AP they create with the
separate `tollgate` network/bridge/firewall this project's own
provision_ssid() sets up for the "archipelago" SSID. Fixed by folding any
default_radioN section left on `lan` onto the `tollgate` network right
after it's created.

Separately, a caller-supplied mint_url with a trailing slash
(https://mint.minibits.cash/Bitcoin/) got written byte-for-byte into
accepted_mints[0].url, which tollgate-wrt string-compares exactly against
a token's embedded (slash-less) mint URL — rejecting every otherwise-valid
token as an "untrusted mint". Fixed by trimming trailing slashes before
the value is used anywhere.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KTdMfVJChCwCCYF1ZTRQLc

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

@@ -240,10 +240,18 @@ impl RpcHandler {
             .unwrap_or_default();
 
         let default_mint_url = format!("http://{}:{}", self.config.host_ip, LOCAL_MINT_PORT);
+        // Trim trailing slash(es): tollgate-wrt matches a token's embedded
+        // mint URL against this value with an exact string compare, and
+        // Cashu wallets (Minibits included) encode mint URLs without a
+        // trailing slash. A stray slash here means every otherwise-valid
+        // token gets rejected as "untrusted mint" — confirmed live against
+        // archy-x250-pa3 2026-09-07 with a manually-entered
+        // "https://mint.minibits.cash/Bitcoin/".
         let mint_url = p
             .get("mint_url")
             .and_then(|v| v.as_str())
             .unwrap_or(&default_mint_url)
+            .trim_end_matches('/')
             .to_string();
 
         let config = TollGateConfig {