[05] Add represented player save transaction timer

[alseif0x]

Refs #17

QA pending: do not merge until capture/manual runtime validation, CI, and Codex reviewer verdict are complete.

Summary:

• Adds represented periodic player autosave from PlayerSaveInterval.
• Wraps current represented CharacterDB save statements in a single transaction.
• Clears dirty flags only after successful commit.

Validation reported locally:

• PROTOC=/home/cdmonio/.local/protoc/bin/protoc cargo test -p wow-world --lib
• PROTOC=/home/cdmonio/.local/protoc/bin/protoc cargo check -p world-server
• cargo fmt --all -- --check
• git diff --check

Manual QA pending: runtime autosave/restart behavior and persistence consistency under disconnect/crash scenarios.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 256845ab92

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[alseif0x]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 99cbbbd365

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[alseif0x]

QA validation checklist:

• Log in, change a persistent player value if possible: health/mana by taking damage/casting, money by buying/selling, or XP by killing a mob.
• Stay online long enough for the periodic save interval, then logout/relogin; the changed values should not roll back.
• Try a teleport/hearth-style transfer and relog afterward; the character should not be saved at a destination before the transfer actually completes.
• Verify normal idle play does not cause server crashes or visible stutters around autosave.

Checks are currently green; leave final status pending user QA.