Match retail Classic character-screen and initial login flow

[MadMaxMangos]

Summary

• match the observed Classic character-screen order by deferring addon metadata until character enumeration and starting Warden after the completed character list
• use the map advertised by SMSG_CHAR_ENUM to avoid redundant login verification while preserving a one-shot admission fallback
• move social lists into the pre-world preamble and add an explicit initial-world entry lifecycle
• consolidate self, inventory, visibility, vessel, and crew creates into one initial object update with the Classic transport header state
• reproduce the retail spell-836 login-effect order, with START delayed until world presentation and GO on the following eligible tick
• keep protocol and ownership rationale inline in the behavioral commits; no standalone docs/ artifacts are included

Intentional scope

Far-worldport and transport-seam ACK handling retain their legacy packet path. Unifying that destination flow is a separate follow-up and this change does not alter its deck-coordinate or movement semantics.

Verification

• cmake --build E:\Mangos\WIP\Zero\Testing\server_build --config RelWithDebInfo --target mangosd mangos_tests --parallel 8
• ctest --test-dir E:\Mangos\WIP\Zero\Testing\server_build -C RelWithDebInfo --output-on-failure
• 16/16 configured tests passed
• repeated Classic 1.12.1 login/relogin testing confirmed smooth world presentation and visible delayed login effect

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This change is 

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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🟢 Metrics 84 complexity · 0 duplication

Metric	Results
Complexity	84
Duplication	0

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[AppVeyorBot]

✅ Build Mangos ZERO Server 22.04.477-wrcqilhd completed (commit e66f61dd73 by @MadMaxMangos)

[AppVeyorBot]

✅ Build Mangos ZERO Server 22.04.477-nbmgiweg completed (commit 9148c992b6 by @MadMaxMangos)