chore(dev): remove the Lightning.Pub-era regtest tooling

docker/ (two compose stacks, dev.sh, regtest.sh, start-with-regtest.sh,
regtest-bootstrap.sh, strfry.conf), packages/nostr-client/dev/ (nine
agent and test scripts), and the seventeen devenv commands that drove
them — infra-*, lncli, btccli, mine-blocks, auto-mine, setup-channel,
alice-*, fund-atm, test-setup, test-payment, node-info — along with the
devenv postgres service, DATABASE_URL, LIGHTNING_PUB_URL, pgcli,
docker-compose and the `just` runner (no justfile exists).

None of it could talk to the app on `dev`. Every piece was built around
Lightning.Pub (a `lightning-pub` service in both compose files, 37
references in dev.sh, LIGHTNING_PUB_PUBKEY and the :1776 API in every
dev script, a NIP-44 v1 implementation the project forbids), and the
last substantive change predates the LNbits cutover that deleted
packages/lightning. No container under either name exists on any
machine. Development runs against LNbits: FakeWallet needs nothing,
bohm's native instance answers on :5001, and the shared regtest stack
lives at ~/dev/local/docker/regtest, outside this repo.

devenv.nix keeps the toolchain, the hardware/serial utilities, the git
hooks and `relay-test`, now pointed at LNbits's bundled nostrrelay. The
Rust toolchain stays for the orphaned crate until that is removed on its
own. nostr-client drops the four dependencies and two devDependencies
only the dead scripts imported (@noble/curves, @scure/base,
@shocknet/clink-sdk, @stablelib/xchacha20, qrcode, ws); lockfile
regenerated, −272 lines.

Verified: devenv.nix parses; nostr-client 43/43 + tsc; clink 11/11 + tsc;
machine app vue-tsc clean. The ndebit-cash-in-flow doc, kept as CLINK
design history, now says the commands it quotes no longer exist here.

packages/nostr-client/package.json

@@ -21,20 +21,14 @@
     "validate-schemas": "tsx scripts/validate-schemas.ts"
   },
   "dependencies": {
-    "@noble/curves": "^2.0.1",
     "@noble/hashes": "^2.0.1",
-    "@scure/base": "^1.2.6",
-    "@shocknet/clink-sdk": "^1.5.4",
-    "@stablelib/xchacha20": "^2.0.1",
     "nostr-tools": "^2.10.0"
   },
   "devDependencies": {
     "@types/node": "^22.19.7",
-    "qrcode": "^1.5.4",
     "tsx": "^4.19.0",
     "typescript": "^5.7.0",
-    "vitest": "^2.1.0",
-    "ws": "^8.19.0"
+    "vitest": "^2.1.0"
   },
   "peerDependencies": {
     "typescript": "^5.0.0"