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

.woodpecker/contracts.yml

@@ -10,7 +10,7 @@ steps:
     image: registry.niovi.voyage/harb/node-ci:latest
     commands:
       - |
-        bash -lc '
+        bash -c '
           set -euo pipefail
           git submodule update --init --recursive
           yarn --cwd onchain/lib/uni-v3-lib install --frozen-lockfile
@@ -22,7 +22,7 @@ steps:
       HARB_ENV: BASE_SEPOLIA_LOCAL_FORK
     commands:
       - |
-        bash -lc '
+        bash -c '
           set -euo pipefail
           cd onchain
           export PATH=/root/.foundry/bin:$PATH
@@ -45,7 +45,7 @@ steps:
     image: registry.niovi.voyage/harb/node-ci:latest
     commands:
       - |
-        bash -lc '
+        bash -c '
           set -euo pipefail
           git submodule update --init --recursive
           yarn --cwd onchain/lib/uni-v3-lib install --frozen-lockfile
@@ -59,7 +59,7 @@ steps:
         from_secret: base_sepolia_rpc
     commands:
       - |
-        bash -lc '
+        bash -c '
           set -euo pipefail
           cd onchain
           export BASE_SEPOLIA_RPC="$BASE_SEPOLIA_RPC"