fix: bugs in message and netadr natives

[Nord1cWarr1or]

🖤

Purpose

Three bugs in the message-hook and netaddr natives, one per issue:

1. GetMessageOrigData with MsgMsgId returned the current message id (getId()) instead of the original one, breaking the native's contract. Every other *Orig* branch in the file already used the original getters, and getOriginalId() has been part of the IMessageContext interface (IMessageManager.h) all along. Resolves GetMessageOrigData(MsgMsgId) returns the current message ID instead of the original one #387.
2. set_netadr / get_netadr cast netadr_s.ip (an unsigned char ip[4] field) to size_t * and wrote/read through it. On LP64 size_t is 8 bytes, so 8 bytes went into a 4-byte field, clobbering the adjacent port and the head of ipx[10] — out-of-bounds access on 64-bit builds. Resolves Out-of-bounds write/read of netadr_s.ip[4] via size_t cast in set_netadr/get_netadr (64-bit builds) #388.
3. CHECK_PARAMBOUNDS logged an error but did not return, so the native kept executing with the out-of-bounds argument.

Approach

• GetMessageOrigData Index case: getId() → getOriginalId().
• The size_t * cast becomes unsigned int * — 4 bytes on both ILP32 and LP64, so the OOB is gone and 32-bit behavior/codegen is unchanged (sizeof(size_t) == sizeof(unsigned int) == 4 there).
• CHECK_PARAMBOUNDS gains return FALSE;. All six use sites audited (SetMessageData, GetMessageData, GetMessageOrigData, GetMessageArgType, IsMessageDataModified, ResetModifiedMessageData): each is a cell-returning native with an existing FALSE error path, so the abort follows the file's own convention.

Open Questions and Pre-Merge TODOs

• Full Linux 32-bit build with the same flags as CI — builds and links cleanly (reapi_amxx_i386.so); the two changed translation units compile with no warnings.
• 64-bit (-m64) syntax-only compile of the changed files — clean.
• Offsets re-checked against netadr_s layout (common/netadr.h): type (4 bytes) is followed by ip[4], so ip is 4-byte aligned and a 4-byte access covers exactly the field.

Learning

netadr_s layout from ReHLDS common/netadr.h; original-id getters from IMessageManager.h.

Resolves: #387, #388, #389