Initial import of verae-middleware from zapier monorepo

.env.example

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+# HTTP
+PORT=3100
+HOST=0.0.0.0
+
+# Upstream Verae
+VERAE_API_BASE_URL=https://api.veraetime.net
+MOCK_VERAE=false
+
+# NATS (Phase 7+)
+# NS1 JetStream is 127.0.0.1:4222 on 70.88.205.138 (not public).
+# Tunnel: ssh -fN -L 14222:127.0.0.1:4222 marchon@70.88.205.138
+# then NATS_URL=nats://127.0.0.1:14222
+NATS_ENABLED=false
+NATS_URL=nats://127.0.0.1:4222
+WAIT_TIMEOUT_MS=25000
+MOCK_JOB_COMPLETE_MS=150
+
+# Security
+TOKEN_SECRET=change-me-in-production
+ADMIN_SECRET=change-me-admin
+
+# Job polling
+JOB_POLL_INTERVAL_MS=2000
+JOB_POLL_MAX_ATTEMPTS=60
+
+# Store
+STORE_PATH=./data/store.json
+
+# Billing UX
+UPGRADE_URL=https://veraetime.net/billing
+
+# Runtime debug (see docs/developer/debugging.md)
+# DEBUG_VERAE=auth,nats,jobs,webhooks,http,billing
+# DEBUG_VERAE_LEVEL=debug
+# DEBUG_VERAE_FILE=/tmp/verae-zapier-debug.log