fix(test): load YAML profiles synchronously in test env

The deferred load via send(self(), :load_profiles) is fine in dev/prod
where SNMP polling starts well after boot, but it races with tests that
exercise discovery immediately after the GenServer starts. With an empty
ETS table, match_profile/2 returns nil and discovery falls back to the
Base profile, breaking tests that rely on YAML-profile-derived
manufacturer strings.

lib/towerops/profiles/yaml_profiles.ex

@@ -88,10 +88,19 @@ defmodule Towerops.Profiles.YamlProfiles do
   @impl true
   def init(_opts) do
     _ = :ets.new(@table, [:named_table, :set, :public, read_concurrency: true])
-    # Defer loading so the supervisor (and Bandit) start immediately.
-    # Profiles will be available within ~60s; SNMP polling starts well after that.
-    send(self(), :load_profiles)
-    {:ok, %{}}
+
+    if Mix.env() == :test do
+      # Load synchronously so tests don't race with deferred loading.
+      raw_profiles = load_all_profiles()
+      mib_names = extract_mib_names_from_profiles(raw_profiles)
+      MibCache.pre_resolve(mib_names)
+      {:ok, %{}}
+    else
+      # Defer loading so the supervisor (and Bandit) start immediately.
+      # Profiles will be available within ~60s; SNMP polling starts well after that.
+      send(self(), :load_profiles)
+      {:ok, %{}}
+    end
   end
 
   @impl true