Consolidate shared game offsets and accessor functions

Extract duplicated WoW 1.12.1 addresses and game accessor functions
into shared modules (src/offsets.zig, src/wow.zig), replacing 5+
copies of getObjectByGUID, isInBattleground, isValidPtr, etc.

- src/offsets.zig: shared address constants (object manager, descriptor
  fields, map/zone, core function addresses, D3D9/GX)
- src/wow.zig: shared accessor functions (pointer validation, object
  manager traversal, field reads, unit helpers, battleground detection,
  game function wrappers, raid target cache)
- Update 10 modules to import from shared instead of inline constants
- Remove outline/wow.zig (promoted to src/wow.zig)
- Trim outline/offsets.zig and markers/offsets.zig to module-specific only

src/bigcursor/bigcursor.zig

@@ -127,7 +127,8 @@ const IconInfo = extern struct {
 // WoW CVar API (1.12.1 build 5875)
 // =============================================================================
 
-const CVAR_LOOKUP: usize = 0x0063DEC0;
+const offsets = @import("../offsets.zig");
+const CVAR_LOOKUP: usize = offsets.FN_CVAR_LOOKUP;
 
 // RegisterCVar: __fastcall(ECX=name, EDX=help, stack: unk1, default, callback, category, unk2, unk3)
 const RegisterCVarFn = *const fn ([*:0]const u8, u32, u32, [*:0]const u8, u32, u32, u32, u32) callconv(hook.cc.fastcall) u32;
@@ -161,8 +162,8 @@ const SVT_UnlockRect: usize = 14;
 const D3DFMT_A8R8G8B8: u32 = 21;
 
 // Game's GxDevice → IDirect3DDevice9 pointer chain
-const GX_DEVICE_PTR: usize = 0xC0ED38;
-const GX_DEVICE_D3D_OFFSET: usize = 0x38A8;
+const GX_DEVICE_PTR: usize = offsets.GX_DEVICE_PTR;
+const GX_DEVICE_D3D_OFFSET: usize = offsets.GX_DEVICE_D3D_OFFSET;
 
 // =============================================================================
 // COM helpers
@@ -611,7 +612,6 @@ pub fn isActive() bool {
 }
 
 pub fn installHooks() void {
-
     const result = mod_mutex.acquire(module_name);
     g_mutex = result.handle;
     g_is_hook_owner = result.is_owner;