Add module control API, bigcursor with fractional scaling, shared mutex

Module control API:
- Three cdecl exports: WeirdUtils_IsModuleActive, WeirdUtils_DisableModule, WeirdUtils_DisableAll
- C header include/weirdutils_api.h for runtime DLL discovery
- All modules gain pub module_name, isActive(), shared mutex via src/mutex.zig
- build.zig refactored to module_list array of ModuleDesc

Bigcursor:
- D3D9 vtable hooks on SetCursorProperties/ShowCursor
- Scale2x/Scale3x pixel-art upscalers in pure Zig (replaces 12K-line hqx C)
- Bilinear resampler for fractional scales (1.0-4.0, default 1.2)
- Win32 cursor via CreateIconIndirect bypasses D3D9 32x32 limit
- FNV-1a hash cache for ~16 cursor bitmaps
- Lua API: SetCursorScale(n) / GetCursorScale()
- CVar cursorScale for Config.wtf persistence (tenths)

Other:
- Add dpslog module stub
- Docs and README updates

src/logsessions/offsets.zig

@@ -4,12 +4,12 @@
 // Combat log path and state
 // =============================================================================
 
-/// Path table pointer — .data section (RW), points to "Logs\WoWCombatLog.txt" string.
+/// Path table pointer - .data section (RW), points to "Logs\WoWCombatLog.txt" string.
 /// Index 0 (0x0084360c) = chat log, index 1 (0x00843610) = combat log.
 /// Overwriting the u32 at this address redirects where the combat log file is created.
 pub const COMBAT_LOG_PATH_PTR: usize = 0x00843610;
 
-/// Chat log path pointer — .data section (RW), points to "Logs\WoWChatLog.txt" string.
+/// Chat log path pointer - .data section (RW), points to "Logs\WoWChatLog.txt" string.
 /// Index 0 in the path table at 0x0084360c.
 pub const CHAT_LOG_PATH_PTR: usize = 0x0084360c;
 
@@ -31,13 +31,13 @@ pub const REALM_NAME_CVAR_BASE: usize = 0x00c28130;
 // Log writing
 // =============================================================================
 
-/// InitializeLogBuffer — __stdcall(filePath: [*:0]const u8, flags: u32, handleOut: *u32).
+/// InitializeLogBuffer - __stdcall(filePath: [*:0]const u8, flags: u32, handleOut: *u32).
 /// Creates a log buffer context. Copies path into context struct (max 260 bytes).
 /// Returns nonzero on success. Callee cleans stack (RET 0xC).
 /// Called by EnableChatLogging (game) and CombatLogAdd (SuperWoW) with hardcoded paths.
 pub const FN_INIT_LOG_BUFFER: usize = 0x0065a0c0;
 
-/// WriteFormattedLogMessage — __stdcall(handle: u32, fmt: [*:0]const u8, va_list: *anyopaque).
+/// WriteFormattedLogMessage - __stdcall(handle: u32, fmt: [*:0]const u8, va_list: *anyopaque).
 /// Three fixed params, callee cleans stack (RET 0xC). Third arg is va_list pointer.
 /// Writes a timestamped, formatted line to the log buffer. Auto-flushes at 48KB.
 pub const FN_WRITE_FMT_LOG_MSG: usize = 0x0065ac20;
@@ -46,7 +46,7 @@ pub const FN_WRITE_FMT_LOG_MSG: usize = 0x0065ac20;
 // Character select / enter world
 // =============================================================================
 
-/// HandleCharacterSelection — void(void), called by Lua EnterWorld().
+/// HandleCharacterSelection - void(void), called by Lua EnterWorld().
 /// Fires when the player clicks "Enter World" on the character select screen,
 /// before world loading and log buffer initialization.
 pub const FN_HANDLE_CHAR_SELECT: usize = 0x0046b500;
@@ -66,4 +66,3 @@ pub const CHAR_ENTRY_SIZE: usize = 0x120;
 
 /// Offset of character name within a character entry.
 pub const CHAR_NAME_OFFSET: usize = 0x08;
-