refactor: consolidate CI and local dev orchestration (#108)

## Summary
- Extract shared bootstrap functions into `scripts/bootstrap-common.sh` (eliminates ~120 lines of duplicated forge/cast commands from e2e.yml)
- Create reusable `scripts/wait-for-service.sh` for health checks (replaces 60-line inline wait-for-stack)
- Merge dev and CI entrypoints into unified scripts branching on `CI` env var (delete `docker/ci-entrypoints/`)
- Replace 4 per-service CI Dockerfiles with parameterized `docker/Dockerfile.service-ci`
- Add `sync-tax-rates.mjs` to CI image builder stage
- Fix: CI now grants txnBot recenter access (was missing)
- Fix: txnBot funding parameterized (CI=10eth, local=1eth)
- Delete 5 obsolete migration docs and 4 DinD integration files

Net: -1540 lines removed

Closes #107

## Test plan
- [ ] E2E pipeline passes (bootstrap sources shared script, services use old images with commands override)
- [ ] build-ci-images pipeline builds all 4 services with unified Dockerfile
- [ ] Local dev stack boots via `./scripts/dev.sh start`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: openhands <openhands@all-hands.dev>
Reviewed-on: https://codeberg.org/johba/harb/pulls/108

containers/txnbot-entrypoint.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ "${CI:-}" == "true" ]]; then
+  # ── CI path ────────────────────────────────────────────────────────
+  echo "[txnbot-ci] Starting Transaction Bot..."
+
+  : "${TXNBOT_PRIVATE_KEY:?TXNBOT_PRIVATE_KEY is required}"
+  : "${RPC_URL:?RPC_URL is required}"
+  : "${KRAIKEN_ADDRESS:?KRAIKEN_ADDRESS is required}"
+  : "${STAKE_ADDRESS:?STAKE_ADDRESS is required}"
+  : "${LIQUIDITY_MANAGER_ADDRESS:?LIQUIDITY_MANAGER_ADDRESS is required}"
+
+  cat > /tmp/txnBot.env <<EOF
+TXNBOT_PRIVATE_KEY=${TXNBOT_PRIVATE_KEY}
+RPC_URL=${RPC_URL}
+KRAIKEN_ADDRESS=${KRAIKEN_ADDRESS}
+STAKE_ADDRESS=${STAKE_ADDRESS}
+LIQUIDITY_MANAGER_ADDRESS=${LIQUIDITY_MANAGER_ADDRESS}
+POOL_ADDRESS=${POOL_ADDRESS:-}
+WETH_ADDRESS=${WETH_ADDRESS:-0x4200000000000000000000000000000000000006}
+EOF
+
+  export TXN_BOT_ENV_FILE=/tmp/txnBot.env
+
+  echo "[txnbot-ci] Environment configured:"
+  echo "  RPC_URL: ${RPC_URL}"
+  echo "  KRAIKEN_ADDRESS: ${KRAIKEN_ADDRESS}"
+
+  echo "[txnbot-ci] Building TypeScript..."
+  npm run build
+
+  exec npm run start
+fi
+
+# ── Local dev path ─────────────────────────────────────────────────
+ROOT_DIR=/workspace
+
+# shellcheck source=entrypoint-common.sh
+source "$ROOT_DIR/containers/entrypoint-common.sh"
+
+entrypoint_checkout_branch "$ROOT_DIR" "txnbot-entrypoint"
+
+TXNBOT_ENV_FILE=$ROOT_DIR/tmp/containers/txnBot.env
+BOT_DIR=$ROOT_DIR/services/txnBot
+
+while [[ ! -f "$TXNBOT_ENV_FILE" ]]; do
+  echo "[txnbot-entrypoint] waiting for env file"
+  sleep 2
+done
+
+entrypoint_require_kraiken_lib "$ROOT_DIR" "txnbot-entrypoint"
+
+cd "$BOT_DIR"
+
+entrypoint_install_deps "txnbot-entrypoint"
+
+echo "[txnbot-entrypoint] Building TypeScript..."
+npm run build
+
+export TXN_BOT_ENV_FILE="$TXNBOT_ENV_FILE"
+exec npm run start