Add bigcursor module stub, rename combatlog to logsessions, bump session timer to 60min

- New bigcursor module skeleton with build integration and mutex
- Rename combatlog module to logsessions (directory, files, build options,
  imports, console prefixes, mutex name, DLL variant, docs)
- Increase log session continuation threshold from 30 to 60 minutes
- Update DLL_README log sessions section

src/logsessions/offsets.zig

@@ -0,0 +1,69 @@
+//! Address constants for log session rotation.
+
+// =============================================================================
+// Combat log path and state
+// =============================================================================
+
+/// 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.
+/// Index 0 in the path table at 0x0084360c.
+pub const CHAT_LOG_PATH_PTR: usize = 0x0084360c;
+
+/// Runtime combat log buffer handle (log_handles[1], BSS).
+/// Non-zero when combat logging is active. Read to check if we can write log lines.
+pub const COMBAT_LOG_HANDLE: usize = 0x00b50544;
+
+/// Runtime chat log buffer handle (log_handles[0], BSS).
+pub const CHAT_LOG_HANDLE: usize = 0x00b50540;
+
+// =============================================================================
+// Realm name
+// =============================================================================
+
+/// CVar base pointer for realm name. Dereference once, then read string at +0x20.
+pub const REALM_NAME_CVAR_BASE: usize = 0x00c28130;
+
+// =============================================================================
+// Log writing
+// =============================================================================
+
+/// 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).
+/// 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;
+
+// =============================================================================
+// Character select / enter world
+// =============================================================================
+
+/// 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;
+
+/// Selected character index (int) on the character select screen.
+pub const CHAR_SELECT_INDEX: usize = 0x0083856c;
+
+/// Character list base pointer. Each entry is 0x120 bytes.
+/// Character name (C string) is at entry + 0x08.
+pub const CHAR_LIST_BASE: usize = 0x00b42144;
+
+/// Number of characters in the character list.
+pub const CHAR_LIST_COUNT: usize = 0x00b42140;
+
+/// Size of each character entry in the character list.
+pub const CHAR_ENTRY_SIZE: usize = 0x120;
+
+/// Offset of character name within a character entry.
+pub const CHAR_NAME_OFFSET: usize = 0x08;
+