Enhancement: TwapOracle::submit_price has no upper-bound sanity check on price

[Jaydbrown]

contracts/oracle/src/lib.rs::submit_price accepts any u64 price with no sanity ceiling. A price submission that's orders of magnitude too large (fat-fingered or malicious admin key) would corrupt the TWAP window until enough correct observations roll it out. A configurable max-deviation-from-last-price check (or an absolute ceiling in OracleConfig) would catch this at submission time instead of propagating into get_twap_price/calculate_fiat_stream_payout.

[deedee-code]

@deedee-code has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer, i will like to work on this issue

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[roycebtx]

@roycebtx has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer, I've reviewed this issue and understand that TransactionResult.status currently includes a 'success' value that isn't produced by any SDK method. I'd like to work on cleaning this up so the implementation and types accurately reflect the SDK's actual behavior while preserving consistency across the codebase. I'm confident I can deliver a clean, well-tested solution that aligns with the project's standards. I'd appreciate it if you could assign this issue to me. Thank you!

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