Update lending pool fuzz target for LP-share model

[K1NGD4VID]

Changes Made

• Removed the empty boilerplate fuzz target file fuzz/fuzz_targets/fuzz_target_1.rs and its binary configuration in fuzz/Cargo.toml.
• Redesigned the invariants inside fuzz/fuzz_targets/lending_pool_fuzz.rs to conform to the share-based model of the contract instead of the stale 1:1 asset-to-share model.
• Updated deposit and withdraw invocations to match current contract signatures (adding the token_id parameter).
• Treated withdraw amount parameters explicitly as share count and renamed local variables (e.g. shares_to_withdraw).
• Added comments explicitly indicating that withdraw parameters are share counts.
• Wrapped fuzz actions in panic::catch_unwind to catch and report contract panics as fuzz crashes.
• Added a sanity check test suite inside lending_pool/src/test.rs that executes the new invariants against a mock LendingPool, passing verification successfully.

Closes #21

[ogazboiz]

thanks for updating the fuzz target, but this can't merge as-is, it would destructively revert main. two hard blockers plus fmt:

1. silent clobber. this branch is 21 commits behind main and carries an OLDER lending_pool/src/lib.rs that DELETES the managed-assets model now on main: it removes TotalManagedAssets, record_yield, set_loan_manager/get_loan_manager, get_total_managed_assets, WithdrawalCooldownActive, reverts CURRENT_VERSION 4->3, and reverts share pricing from total_managed_assets back to raw read_pool_balance. merging would silently wipe that with no conflict marker. please rebase: git fetch origin && git rebase origin/main (drop the stale lending_pool changes so the diff is fuzz-only), then re-run CI.

2. it also bundles an older copy of your #39 remittance_nft consolidation (commit 0a46b75), which both duplicates #39 and re-introduces the trailing-whitespace fmt issues #39 already fixed. after rebasing, drop the remittance_nft commit and keep #41 fuzz-only, #39 is the canonical version of that change.

3. fmt fails: lending_pool/src/test.rs:1520,1541,1548,1560,1573 and remittance_nft/src/lib.rs:608 + test.rs:1901. run cargo fmt --all from the repo root.

one semantic note for after the rebase: the fuzz invariant assert_no_value_creation uses raw token pool_balance as the redeemable basis, but on main share value derives from TotalManagedAssets, so the invariant may be stale against the current model, worth a look once it's rebased.

rebase to fuzz-only + fmt and i'll re-review.

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