Add Spoolman card_uid lookup, Snapmaker U1 CARD_UID API, and wifi_ssid/wifi_pass commands

[ChrisBGL]

Summary

1. Spoolman card_uids lookup (NetworkManager.cpp, main.cpp)

• fetchSpoolmanByExternalId fetches /api/v1/spool?allow_archived=true in a single HTTP request and iterates all spools in one pass
• Priority 1: checks spool.extra.card_uids (Spoolman JSON-encoded string, comma-separated) against data.hardware_uid — normalises both sides (uppercase, strip colons/hyphens/spaces/quotes/0x prefix) before comparing
• Priority 2: falls back to lot_nr match if no card_uid hit is found
• fetchSpoolmanData gate widened: hardware_uid or lot_nr now triggers the lookup (previously required hardware_uid)
• main.cpp Spoolman fetch condition extended to also fire when hardware_uid is set

2. Snapmaker U1 CARD_UID payload (NetworkManager.cpp)

• When hardware_uid is valid, sends {"channel":N,"info":{"CARD_UID":[86,132,77,206]}} instead of vendor/material/colour fields — the U1 Extended Firmware resolves the spool from Spoolman automatically via CARD_UID
• UID normalisation: strips 0x, colons, hyphens, spaces, quotes; uppercases; splits into decimal byte array (e.g. 56:84:4D:CE → [86,132,77,206])
• Validation before sending: non-empty, even hex-character length, only [0-9A-F] — logs error and skips request if invalid
• Backwards compatible: falls back to existing VENDOR/MAIN_TYPE/RGB_1/... payload when no valid UID is present
• Serial debug logs show raw UID, normalised UID, byte array, and HTTP response

3. Wi-Fi SSID/password with spaces (SerialTerminal.cpp)

• New commands set wifi_ssid <ssid> and set wifi_pass <password> accept the full remainder of the line, so SSIDs or passwords containing spaces work without quoting
• Existing set wifi <ssid> <password> is unchanged (backwards compatible)
• get config outputs set wifi_ssid / set wifi_pass when the stored SSID contains spaces, so the output is always directly re-enterable
• help text updated to document all three variants

Test plan

• pio test -e desktop — 18/18 tests pass (verified)
• pio run -e pn5180 — builds and flashes successfully (verified)
• Scan a proprietary tag with a UID stored in spool.extra.card_uids in Spoolman — spool resolves correctly
• Scan a Bambu/lot_nr tag without card_uid — existing lot_nr fallback still works
• U1 configured: tag with valid UID — Serial log shows CARD_UID byte array, U1 accepts request
• U1 configured: tag without UID — falls back to VENDOR/MAIN_TYPE payload as before
• set wifi_ssid My Network Name + set wifi_pass secret — connects successfully
• set wifi simpleSSID password — still works as before

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