build: migrate from Make to Zig build system + Just

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I7585121a5ec8e797adc43ba8e30d4ac86a6a6964

build.zig

@@ -0,0 +1,73 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    // Zig combat library
+    const combat_lib = b.addLibrary(.{
+        .name = "combat",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("libs/combat/combat.zig"),
+            .target = target,
+            .optimize = optimize,
+            .link_libc = true,
+        }),
+    });
+    combat_lib.addIncludePath(b.path("src"));
+
+    // C sources (everything except combat, which is now Zig)
+    const c_sources = [_][]const u8{
+        "src/audio.c",
+        "src/enemy.c",
+        "src/items.c",
+        "src/main.c",
+        "src/map.c",
+        "src/player.c",
+        "src/render.c",
+        "src/rng.c",
+        "src/settings.c",
+        "src/utils.c",
+    };
+
+    const c_flags = [_][]const u8{
+        "-std=c99",
+        "-Wall",
+        "-Wextra",
+        "-O2",
+    };
+
+    // Main executable
+    const exe = b.addExecutable(.{
+        .name = "roguelike",
+        .root_module = b.createModule(.{
+            .target = target,
+            .optimize = optimize,
+            .link_libc = true,
+        }),
+    });
+
+    exe.addCSourceFiles(.{
+        .files = &c_sources,
+        .flags = &c_flags,
+    });
+
+    exe.addIncludePath(b.path("src"));
+    exe.linkLibrary(combat_lib);
+    exe.linkSystemLibrary("raylib");
+    exe.linkSystemLibrary("m");
+    exe.linkSystemLibrary("pthread");
+    exe.linkSystemLibrary("dl");
+    exe.linkSystemLibrary("rt");
+
+    b.installArtifact(exe);
+
+    // Run step
+    const run_cmd = b.addRunArtifact(exe);
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+    const run_step = b.step("run", "Build and run the roguelike");
+    run_step.dependOn(&run_cmd.step);
+}