[NFC] Fix MIFARE Plus 2K SL1 transit parsers (#1037)

[mishamyte]

Summary

Fixes #1037. After #1016 introduced MfClassicType2k and promoted genuine MIFARE Plus S/X 2K cards in SL1 (SAK 0x08 + Plus ATS) from MfClassicType1k, the supported-card parsers for those cards broke.

Root cause

1. Type gate — *_get_card_config() / type-branched extraction accepted only 1K/4K, so parse() rejected 2K (plantain, troika).
2. Full-read completion — mf_classic_is_card_read() needs 32 sectors/64 keys for 2K (was 16/32). A targeted read() keying only its own sectors returns MfClassicErrorPartialRead → is_read=false → the app diverts to the dict-attack scene and never reaches parse() (sevppk, szppk_so, two_cities).

Fix

Treat MfClassicType2k as the Classic 1K these cards present (same lower-sector keys/data sector) and accept a partial read:

• plantain — 2K case in get_card_config + extract_purse_data; accept PartialRead
• troika — 2K case in get_card_config; accept PartialRead
• sevppk_tk, szppk_so, two_cities — accept PartialRead (parse is type-independent)

social_moscow/kazan (plain Classic) and sk_tk (4K) aren't promoted to 2K → unchanged.

Testing

fbt fap_{plantain,troika,szppk_so,two_cities,sev_tk}_parser builds clean. On-hardware validation with real cards still pending.

Closes #1037

🤖 Generated with Claude Code

[github-actions]

🤖 Build & analyze — bug-1037-plus-2k-sl1-parsers @ bfaa4950

✅ Firmware built — artifact unleashed-fw-bug-1037-plus-2k-sl1-parsers-bfaa4950 (run)

💾 Flash & RAM — f7 (ble_light)

Metric	Size
Firmware (flash)	855.17 KiB
DFU image	855.47 KiB
Reserved — radio stack + FUS	164.00 KiB
Free flash (usable)	4.83 KiB ⚠️
RAM (.data + .bss)	7.94 KiB

_{1 MiB flash = firmware + usable free + radio/FUS. The BLE coprocessor stack sits at the top of flash (load addr 0x080D7000); the linker's .free_flash (168.83 KiB) counts that region as free, so usable free = .free_flash − reserved (164.00 KiB).}

📋 Public API changes

✅ No public API changes in this PR.