Feat/live-testnet-property-test

[Mac-5]

closes #454
closes #453
closes #455
closes #451

4d12800 - Add network-aware RPC config for frontend
Added config/rpc_endpoints.json
Added frontend network config loading in frontend/src/config/rpc-endpoints.ts
Wired the landing page and adapter to read NEXT_PUBLIC_STELLAR_NETWORK
Added fallback RPC handling in frontend/src/utils/stellarswipe-adapter.ts
Added endpoint verification script in scripts/verify_rpc_endpoints.ts

a128ce2 - Add live testnet e2e harness
Added tests/e2e/test_full_flow.ts
Added nightly workflow in .github/workflows/e2e-nightly.yml
Added deployment-state notes in deployments/README.md
Added e2e usage notes in tests/e2e/README.md

5036314 - Add fee collector property tests
Wired test module loading in stellar-swipe/contracts/fee_collector/src/lib.rs
Added stellar-swipe/contracts/fee_collector/src/tests/property_tests.rs
Added stellar-swipe/contracts/fee_collector/src/tests/mod.rs

66625e1 - Add user portfolio property tests
Added proptest dev-dependency in stellar-swipe/contracts/user_portfolio/Cargo.toml
Wired the tests module in stellar-swipe/contracts/user_portfolio/src/tests/mod.rs
Added stellar-swipe/contracts/user_portfolio/src/tests/property_tests.rs

I did not run tests or compile the codebase, per your instruction.
If you want, I can next help you:
populate deployments/testnet.json with the expected live contract IDs,
add the missing CI secrets/env var checklist for the nightly e2e job,
tighten the e2e harness to parse and assert returned contract values instead of only transaction success.

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