Lp share token tracking

[githoboman]

Implemented LP-share transfer tracking, surfacing liquidity-pool deposits/withdrawals as first-class LP-share transfers tagged with the pool ID.
Closes #142
New module — src/indexer/lp-shares.ts
A self-contained, pure decoder mirroring the existing NFT ingester / decoder style:

isLpShareEvent / parseLpShareEvent / parseLpShareEvents — detect and decode LP events, never throwing (a bad event yields null so it can't stall ingest).
Handles both event dialects seen in Soroban AMMs:
Explicit deposit/withdraw (Soroswap, Phoenix, …) — provider in topics[1].
Bare SEP-41 mint/burn of the pool's own share token (native liquidity_pool SAC) — recipient in topics[2] for mint, holder in topics[1] for burn.
A deposit is modelled as shares minted to the provider (toAddress, no from); a withdrawal as shares burned from the provider (fromAddress, no to) — consistent with how decoder.ts treats mint/burn.
extractShares reads the share amount from a bare i128 or a map-wrapped value (share_amount/shares/amount/…), since AMMs bundle several figures into the value; returns the absolute value as a decimal string, preserving full i128 precision.
upsertLpShareTransfers — idempotent bulk insert (skipDuplicates on eventId).
Schema & migration
New LpShareTransfer model in prisma/schema.prisma with a poolId column (the emitting pool contract — always available on the row), action, from/to, shares, ledger fields, and a unique eventId. Indexed on poolId, poolId+action, addresses, ledger, txHash.
Migration 20260629130000_add_lp_share_transfers, following the tombstones migration's exact SQL conventions.
Wiring
src/indexer.ts — added an LP-share path to pollOnce, best-effort and additive (deposit/withdraw aren't touched by the fungible path; a pool's own share mint/burn is recorded here in addition to its token row), plus an updated processed-events log line.
src/db.ts — rollbackToLedger now also prunes LP-share rows above the target ledger during reorgs.
Verification
tsc --noEmit passes clean across the whole project.
New suite src/tests/lpShares.test.ts — 25 tests, all passing (both dialects, share extraction from bare/map/large/negative values, pool-ID tagging, batch filtering, idempotent insert).
Full jest run: my change adds zero new failures. The 3 failing suites are pre-existing tests/integration/ vitest files (run via the se

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