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feat(sdkconfig): enable PSRAM on bitaxe boards + tdongle-s3 (#433)

OTA pull from GitHub was failing on bitaxe-650 with mbedTLS
`Dynamic Impl: alloc(16749 bytes) failed` mid-handshake. Root cause:
the TLS record buffer needs a contiguous ~17KB internal-heap block,
but the dual-ASIC build leaves only ~34KB largest contiguous block
at idle and fragmentation eats into that during the handshake.
Reboot was not a reliable workaround on the 650.

All three bitaxe boards use ESP32-S3-WROOM-1-N16R8 (confirmed via
bitaxeorg KiCad schematics) — 16MB flash, 8MB octal PSRAM. The
PSRAM was unused (CONFIG_SPIRAM=n in sdkconfig.defaults).

enable PSRAM in 80MHz octal mode on bitaxe-403, bitaxe-601, and
bitaxe-650; route WiFi/LWIP buffers to PSRAM and switch mbedTLS to
external-mem allocator. result: internal heap improves AND mbedTLS
buffers land in 8MB PSRAM, so OTA pull no longer fragmentation-fails.

empirically verified on all three bitaxes (OTA push of this build,
then POST /api/update/check succeeds with last_check_ok: true):
  bitaxe-650: largest_free_block 34816 → 8257536, internal +32KB
  bitaxe-601: largest_free_block 43008 → 8257536, internal +22KB
  bitaxe-403: similar profile

tdongle-s3 also gets a PSRAM-enabling overlay with quad mode +
CONFIG_SPIRAM_IGNORE_NOTFOUND=y. LilyGo ships T-Dongle S3 in
no-PSRAM and "Plus" (with PSRAM) variants; IGNORE_NOTFOUND lets the
same binary boot cleanly on either (verified on a no-PSRAM unit:
boots normally, PSRAM init logs warning, falls back to internal heap).
platformio.ini updated to load the new sdkconfig/tdongle-s3 overlay.

esp32-wroom32 left unchanged — no PSRAM hardware on standard module.

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