Add InfluxDB timedata persistence and edge config volume mount

[amalbet]

Summary

• Add InfluxDB 1.8 as a dedicated container with healthcheck, named volume (influxdb-data), and backend dependency
• Replace no-op Dummy timedata provider with InfluxDB provider config (timedata0.config)
• Volume-mount openems-edge/config.d → /etc/openems.d so Felix configs survive docker compose down/up
• Fix Metadata/Odoo.config to use Docker service names (db, odoo16) instead of localhost
• Fix edge backend controller apikey to match Odoo device registration
• Include Felix runtime config updates (Core, Ess, Evcs components)

Closes #56, closes #57

Verification steps

# 1. Rebuild and start
docker compose build openems-backend
docker compose up -d

# 2. Verify InfluxDB is receiving data (wait ~60s for edge to connect)
curl -s http://localhost:8086/query --data-urlencode "q=SHOW MEASUREMENTS ON openemsdb"
# Should list "data" measurement

# 3. Query simulation data
curl -s http://localhost:8086/query --data-urlencode "db=openemsdb" \
  --data-urlencode "q=SELECT last(\"meter0/ActivePower\") FROM data"
# Should return non-null value

# 4. Verify edge configs persist
docker compose down && docker compose up -d
# Edge should start with all simulation components (check logs)
docker compose logs openems-edge | grep "Scheduler"

# 5. Verify UI shows edge
# Browse to http://localhost:4200, login admin/admin
# Should see edge0 with live simulation data

Storage estimate

~12 MB/day for simulation data (500 fields, ~288 writes/day)

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