fix(integration): handle percent_encoded host in extractLocalPort

[YeonV]

Problem

extractLocalPort in src/core/integration.zig only matches .raw in its host switch:

return switch (host) {
    .raw => |value| if (isLocalHost(value)) port else null,
    else => null,
};

However, Zig 0.16's std.Uri.parse always stores the host component as .percent_encoded, never .raw — as confirmed by Zig's own stdlib tests:

try testing.expectEqualStrings("127.0.0.1", host.?.percent_encoded);

This means the .raw branch is dead code for any parsed URI. As a result, linked_tracker and linked_boilers are always null/empty regardless of the configured URLs, even when http://127.0.0.1:7700 is correctly set.

Fix

Match both variants in the switch:

return switch (host) {
    .raw, .percent_encoded => |value| if (isLocalHost(value)) port else null,
};

Impact

Without this fix, the NullBoiler integration page always shows "NullTickets Link: not found" and the NullTickets page always shows "Linked nullboilers: not found", even when the integration is correctly wired and functionally working.