Fix templating errors in InfluxDB configuration commands

[Copilot]

The docker-compose migration introduced three critical templating issues that would prevent InfluxDB from starting or configuring correctly.

Fixed:

• Environment variable typo: INFLUXDB_DATA_CACHE_MAX_MEMORY_SYZE → INFLUXDB_DATA_CACHE_MAX_MEMORY_SIZE
• Quote escaping in all InfluxDB CLI commands (users, databases, retention policies)
• Retention policy name using hardcoded oneweek instead of configured {{ influxdb_retention_policy.policy_name }}

Example of quote fix:

# Before - malformed quotes cause syntax errors
influx -execute "CREATE USER "{{ item.username }}" WITH PASSWORD '"{{ item.password }}"'"

# After - properly escaped
influx -execute "CREATE USER \"{{ item.username }}\" WITH PASSWORD '{{ item.password }}'"

Known limitations (not addressed):

• influxdb_https_enabled expects string "true" not boolean
• User permissions rely on list index ordering
• Grafana permissions hardcode database list vs using influxdb_databases
• Commands lack idempotency (will fail on reruns)

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