dangernoodle-io / TaipanMiner / 26491871100

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fix(sdkconfig): drop PSRAM enablement from tdongle-s3 (no PSRAM hardware) (#434)

LilyGo T-Dongle S3 ships with no PSRAM by default ("16 MB QD, No PSRAM"
per their board JSON). v0.24.2 (#433) added the bitaxe-style PSRAM
Kconfig group with CONFIG_SPIRAM_IGNORE_NOTFOUND=y on the assumption
that the same binary would work on both standard and Plus variants:
present hardware would be used, absent hardware would log a warning
and fall through.

In practice the IGNORE_NOTFOUND fall-through is degraded:
- intermittent boot panic in bb_registry_init_early when EARLY-tier
  components alloc heap (suspected interaction between
  SPIRAM_USE_MALLOC, SPIRAM_TRY_ALLOCATE_WIFI_LWIP, and the absent
  PSRAM chip leaving the allocator in a worse state than no-SPIRAM)
- heap_minimum_ever_free 55,556 with PSRAM Kconfigs vs 83,416 without
- heap_largest_free_block 34,816 vs 47,104 (fresh boot)
- OTA pull from GitHub fails with mbedTLS alloc(16749) failed at
  uptime ~40s (the v0.24.1 tdongle OTA failure)

revert the tdongle-s3 overlay to its pre-#433 state (empty delta from
sdkconfig.defaults). resolves the OTA pull failure for standard
T-Dongle S3 users and eliminates the boot panic. confirmed on bench:
TLS update-check succeeds, heap healthier, no rollback.

T-Dongle S3 Plus support (with PSRAM) tracked under TA-394 — when one
becomes available, add a separate tdongle-s3-plus env mirroring the
bitaxe pattern.

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