Implement full MVP: auth, HD wallet, Electrum client, deposits, bets, round/draw engine, payout, withdrawals, RBF, admin+audit

All 10 build-order stages complete and unit-tested (49 tests). Verified live on
mainnet: registration/address derivation, deposit crediting, a real 10 PLM bet
(broadcast + confirmed + change credited). A full round close->draw->payout
cycle was triggered live and was in progress at commit time. Withdrawal and RBF
bump are unit-tested but not yet exercised against a live broadcast. Known gaps
(scheduler doesn't resume mid-flight rounds after restart, payout has no retry,
no deployment setup, etc.) are documented in CLAUDE.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/wallet/plm_network.py

@@ -0,0 +1,28 @@
+"""PLM mainnet params for embit, verified against PalladiumWallet/src/Core/Chain/ChainProfiles.cs.
+
+Threaded explicitly through every embit call via `network=PLM_MAINNET` rather than
+registered globally, since this is a long-lived async server (embit has no
+concept of "current network" beyond what you pass in).
+"""
+
+PLM_MAINNET = {
+    "name": "PLM Mainnet",
+    "wif": bytes([0x80]),
+    "p2pkh": bytes([55]),
+    "p2sh": bytes([5]),
+    "bech32": "plm",
+    "xprv": bytes.fromhex("0488ade4"),
+    "xpub": bytes.fromhex("0488b21e"),
+    "yprv": bytes.fromhex("049d7878"),
+    "ypub": bytes.fromhex("049d7cb2"),
+    "zprv": bytes.fromhex("04b2430c"),
+    "zpub": bytes.fromhex("04b24746"),
+    "Yprv": bytes.fromhex("0295b005"),
+    "Ypub": bytes.fromhex("0295b43f"),
+    "Zprv": bytes.fromhex("02aa7a99"),
+    "Zpub": bytes.fromhex("02aa7ed3"),
+    "bip32": 0,
+}
+
+BIP44_COIN_TYPE = 746
+ACCOUNT_PATH = f"m/84h/{BIP44_COIN_TYPE}h/0h"