* Remove backfill-flag-configs script
One-time migration has been run; script is no longer needed.
https://claude.ai/code/session_014RUwPfm1qc539xLxW4m9Uy
* Clean up flag config code
- FlagSvg: remove redundant getDisplayFlagConfig call; config is already a
valid FlagConfig by type, so the validation/fallback was dead code. Also
replace the unreachable `?? "#adf661"` fallback with a non-null assertion.
- team/user models: pre-generate ID before insert so flagConfig is persisted
immediately on creation rather than relying on display-time generation.
- auth.server.ts: add create.after hook so BetterAuth-created users also get
a flagConfig written to the DB on signup.
https://claude.ai/code/session_014RUwPfm1qc539xLxW4m9Uy
* Fix lint: replace non-null assertion in FlagSvg with destructure defaults
oxlint forbids the ! operator; destructuring with empty-string defaults
is equivalent since FlagConfig always has 3 colors.
https://claude.ai/code/session_014RUwPfm1qc539xLxW4m9Uy
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Co-authored-by: Claude <noreply@anthropic.com>