fix(collector): support legacy Redfish firmware

[orangeCatDeveloper]

Part of #3210

Fan and PowerSupply collection fails on older Dell iDRAC firmware with StatusCode 404, and cached Redfish sessions are not released.

Newer Redfish schemas expose fans and power supplies as standalone collections, while older iDRAC firmware embeds them in Thermal and Power; the collector only probes the newer paths. Session cleanup also resolves the server-provided Location against the session service path, producing an invalid DELETE target.

Probe modern and legacy layouts per chassis, resolve embedded # JSON Pointer members from their containing document, reuse fetched documents, and map legacy fan Reading to RPM. Session requests now resolve relative and same-origin absolute resource URIs, reject cross-origin or downgraded targets before attaching X-Auth-Token, and accept every Redfish DELETE success status.

Boundary: the session-creation 405 still needs HTTP Basic Auth fallback, and no verified pre-2020.4 Battery resource is available.

Validation uses a temporary Docker HTTP service seeded with the user-reported legacy iDRAC payload; hardware validation is still pending.

Before
ERROR ... ThermalSubsystem/Fans ... StatusCode 404
fan rows = 0
session release: FAILED - Redfish session close error:null

After
FAN_ROWS=[[/redfish/v1/Chassis/Modern/ThermalSubsystem/Fans/1, Modern Fan, Enabled, OK,  , 7200], [/redfish/v1/Chassis/Legacy/Thermal#/Fans/0, Legacy Fan, Enabled, OK,  , 3480]]
POWER_ROWS=[[/redfish/v1/Chassis/Modern/PowerSubsystem/PowerSupplies/1, Modern Power Supply, Enabled, OK], [/redfish/v1/Chassis/Legacy/Power#/PowerSupplies/0, Legacy Power Supply, Enabled, OK]]
sessionActive=false
DELETE /redfish/v1/SessionService/Sessions/1 HTTP/1.1 202