Feature/automatic pdu link planner (multi-phase, connector-aware balancing) v25.01+

[alex001x]

Feature: Automatic PDU Link Planner

This PR introduces a new Automatic PDU Link Planner for OpenDCIM v25.01+.
It automates power connections between devices and PDUs based on connector type, phase, and load balancing.

Key features
Three selectable operation modes:

Mode 1 – Load Balanced: evenly distributes all devices. (for one or more PDU)
Mode 2 – Dual Power Path: splits dual-fed devices between two PDUs.
Mode 3 – Intelligent Power Planner: balances load across C13/C19 connectors and phases (A/B/C).

Technical details :
Added modal and AJAX workflow (ajax_generate_powerplan.php, ajax_apply_powerplan.php).
Full compatibility with schema 25.01 (tables: fac_PowerConnectors, fac_PowerPhases, fac_PowerVoltages).
Handles connector/phase detection and generates alerts if incomplete.
Applies and logs connections into:
fac_PowerConnection
fac_PowerPorts (ConnectorID, PhaseID, VoltageID)
Visual power load summary with color-coded phase bars.
Integrated with i18n (new entries in openDCIM.po).

Requirements :
OpenDCIM v25.01 or later.
At least one cabinet with 2 PDUs to use the Intelligent mode.
Proper ConnectorID and PhaseID configuration in fac_PowerPorts.

Access control :
Read-only users → preview and print only.
Write-access users → can apply and persist changes.

Localization :
All strings wrapped in __() with English/French translations provided.

Example usage :
Open cabnavigator.php?cabinetID=
Click Automatic PDU Link Planner
Choose a mode → Generate Plan
Optionally Apply and Save or Print Power Plan