cleanup phase 2: delete HTTP-streaming-era dead code

Both sides simultaneously because the script's X-Frame-Seq sender and
the firmware's X-Frame-Seq receiver negotiated a contract that's now
retired entirely.

Firmware (main/http_api.c):
- Delete static uint32_t s_last_painted_seq (declaration + reset in
  state_post_handler + the read in frame_post_handler + the
  assignment after paint).
- Delete the X-Frame-Seq header read (httpd_req_get_hdr_value_str
  + strtoul block).
- Delete the X-Frame-Drop: stale-seq response path.
- Delete the entire Server-Timing httpd_resp_set_hdr block.
- Delete the setsockopt(TCP_NODELAY) at frame_post_handler entry.
  /frame is a single body POST → empty 204; no second packet for
  Nagle to coalesce with on the response side.
- Delete static int64_t s_last_post_us + the idle_us computation.
  /frame fires at most once per wake; idle gap between wakes is
  dominated by user/event timing, not anything firmware-controllable.
- Drop the per-10-frames condition on the timing log — /frame fires
  rarely enough that one log per snapshot is the right cadence —
  and rename "frame N: ..." → "snapshot: ..." to match.
- Drop cfg.max_open_sockets 4 → 2 (snapshot POST + concurrent /state
  or /config).
- Drop #include "lwip/sockets.h" (orphaned with TCP_NODELAY).

Script (scrypted/scrypted-viewport.ts):
- Delete the agents Map + agentFor() method (per-host keepAlive
  Agent pool; over-engineered for ~1 POST/min control plane).
- Delete httpRequest() helper (40 lines wrapping http.request to
  surface tHeaders/tDone — no consumer reads those fields anymore).
- Rewrite postJSON() to a 10-line fetch() with AbortSignal.timeout.
- Delete the frameSeq Map + the seq counter + X-Frame-Seq header on
  the snapshot fetch + the X-Frame-Drop response check + the
  frameSeq.delete in stopStream.
- Extract buildVf(orientation, panelW, panelH) helper near top of
  ScryptedViewportProvider — used by both startStream (live) and
  pushSnapshot (one-shot ffmpeg fallback).

TCP_NODELAY references remain in the live-stream socket path
(scrypted-viewport.ts:773, 788). That's a different socket (raw
net.Socket on TCP/81) and noDelay there is what eliminates Nagle
stalls under the streaming-heavy live workload. Load-bearing.

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