[codex] feat(dashboard): add Settings tab

[ScriptedAlchemy]

Summary

• Add a Settings dashboard plugin with project indexing, user upload/watch, automation summary, environment, storage, and version sections.
• Add aggregated GET /api/settings plus validated PATCH /api/settings/project and PATCH /api/settings/user endpoints.
• Wire the plugin into dashboard build/assets/capabilities and document the Settings API.

Verification

• cargo fmt --check
• cd dashboard && npm run build
• cd dashboard && npm run test
• TMPDIR=/tmp CARGO_TARGET_DIR=/tmp/tracedecay-target-dashboard-settings-master cargo check
• TMPDIR=/tmp CARGO_TARGET_DIR=/tmp/tracedecay-target-dashboard-settings-master cargo test --test dashboard_api_test --no-fail-fast

Note: TMPDIR=/tmp avoids this runner's missing /scratch/tmp default during Rust/C compiler temp-file creation.

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[chatgpt-codex-connector]

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