scheianu 36de1623c2 Add HMAC-SHA256 API authentication to board drivers and edit UI ...

- Both olimex_esp32_c6_evb and olimex_esp32_c6_evb_pn532 drivers now
  sign every API request with X-Request-Time / X-Request-Sig headers
  using HMAC-SHA256(api_secret, METHOD:path:unix_timestamp)
- Board model gains api_secret column (nullable, default None)
- boards.py edit route saves api_secret from form
- edit.html adds API Secret input with cryptographic Generate button
- If api_secret is empty/None, headers are omitted (backward compat)

2026-03-15 12:33:45 +02:00

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