Relax API rate limits for self-hosted deployments (#2465)

- Introduced NoopApiRateLimiter to effectively disable API rate limiting for self-hosted mode.
- Updated ApiRateLimiter to delegate to NoopApiRateLimiter when running self-hosted.
- Increased Rack::Attack throttle limits significantly for self-hosted deployments.
- Added tests for NoopApiRateLimiter to ensure correct behavior.
- This allows self-hosted users to make more API requests without restriction, while keeping stricter limits for SaaS deployments.

test/services/noop_api_rate_limiter_test.rb

@@ -0,0 +1,58 @@
+require "test_helper"
+
+class NoopApiRateLimiterTest < ActiveSupport::TestCase
+  setup do
+    @user = users(:family_admin)
+    # Clean up any existing API keys for this user to ensure tests start fresh
+    @user.api_keys.destroy_all
+
+    @api_key = ApiKey.create!(
+      user: @user,
+      name: "Noop Rate Limiter Test Key",
+      scopes: [ "read" ],
+      display_key: "noop_rate_limiter_test_#{SecureRandom.hex(8)}"
+    )
+    @rate_limiter = NoopApiRateLimiter.new(@api_key)
+  end
+
+  test "should never be rate limited" do
+    assert_not @rate_limiter.rate_limit_exceeded?
+  end
+
+  test "should not increment request count" do
+    @rate_limiter.increment_request_count!
+    assert_equal 0, @rate_limiter.current_count
+  end
+
+  test "should always have zero request count" do
+    assert_equal 0, @rate_limiter.current_count
+  end
+
+  test "should have infinite rate limit" do
+    assert_equal Float::INFINITY, @rate_limiter.rate_limit
+  end
+
+  test "should have zero reset time" do
+    assert_equal 0, @rate_limiter.reset_time
+  end
+
+  test "should provide correct usage info" do
+    usage_info = @rate_limiter.usage_info
+
+    assert_equal 0, usage_info[:current_count]
+    assert_equal Float::INFINITY, usage_info[:rate_limit]
+    assert_equal Float::INFINITY, usage_info[:remaining]
+    assert_equal 0, usage_info[:reset_time]
+    assert_equal :noop, usage_info[:tier]
+  end
+
+  test "class method usage_for should work" do
+    usage_info = NoopApiRateLimiter.usage_for(@api_key)
+
+    assert_equal 0, usage_info[:current_count]
+    assert_equal Float::INFINITY, usage_info[:rate_limit]
+    assert_equal Float::INFINITY, usage_info[:remaining]
+    assert_equal 0, usage_info[:reset_time]
+    assert_equal :noop, usage_info[:tier]
+  end
+end