Add outline rendering system ported from C++ to Zig

Port the model outline hook system (CM2SceneRenderDraw, ManageRenderListNode,
DrawBatchProjected) from the C++ idris DLL to pure Zig. Includes D3D9 vtable
hooks for stencil-based outline rendering with per-category colors and thickness.

Fix GetObjectByGUID calling convention: was using fastcall (ECX/EDX) but Ghidra
confirms it's __stdcall with stack params and RET 8. Fix lua_pushcclosure address
from 0x6F3B80 (mid-body of another function) to 0x6F3920.

Guard resolveModelOwner in DrawBatchProj with hasTargets() check and cache unit
model status during ManageRenderListNode to avoid raw pointer chasing at render
time. Add IsBadReadPtr validation in resolveModelOwner to match C++ IsValidReadPtr
pattern for page-level memory safety.

src/main.zig

@@ -2,6 +2,7 @@ const std = @import("std");
 const hook = @import("hook");
 const screenshot = @import("screenshot.zig");
 const interact = @import("interact.zig");
+const outline = @import("outline/api.zig");
 
 const WINAPI = std.builtin.CallingConvention.winapi;
 const fc: std.builtin.CallingConvention = .{ .x86_fastcall = .{} };
@@ -99,7 +100,7 @@ pub const lua = struct {
     }
 
     pub fn pushcclosure(L: State, func: usize, n: i32) void {
-        const f: *const fn (State, usize, i32) callconv(fc) void = @ptrFromInt(0x6F3B80);
+        const f: *const fn (State, usize, i32) callconv(fc) void = @ptrFromInt(0x6F3920);
         f(L, func, n);
     }
 
@@ -239,6 +240,7 @@ fn registerLuaFunctions() void {
     registerFunction("WeirdUtilsScreenshot", @intFromPtr(&screenshot.screenshotCommand));
     registerFunction("InteractNearest", @intFromPtr(&interact.interactNearest));
     registerFunction("LootAllCorpses", @intFromPtr(&interact.lootAllCorpses));
+    registerFunction("OutlineCommand", @intFromPtr(&outline.outlineCommand));
 }
 
 // =============================================================================
@@ -452,6 +454,7 @@ fn engineInitDetour() callconv(sc) void {
     const orig = engine_init_hook.getTrampoline(*const fn () callconv(sc) void);
     orig();
     screenshot.installHook();
+    _ = outline.init();
 }
 
 // =============================================================================
@@ -503,6 +506,7 @@ fn install() void {
 fn uninstall() void {
     shutdown_hook.remove();
     engine_init_hook.remove();
+    outline.cleanup();
     screenshot.removeHook();
     interact.removeHooks();
     load_addons_hook.remove();