fix: background task media delivery + vision download timeout (#3919)

* feat(telegram): add webhook mode as alternative to polling

When TELEGRAM_WEBHOOK_URL is set, the adapter starts an HTTP webhook
server (via python-telegram-bot's start_webhook()) instead of long
polling. This enables cloud platforms like Fly.io and Railway to
auto-wake suspended machines on inbound HTTP traffic.

Polling remains the default — no behavior change unless the env var
is set.

Env vars:
  TELEGRAM_WEBHOOK_URL    Public HTTPS URL for Telegram to push to
  TELEGRAM_WEBHOOK_PORT   Local listen port (default 8443)
  TELEGRAM_WEBHOOK_SECRET Secret token for update verification

Cherry-picked and adapted from PR #2022 by SHL0MS. Preserved all
current main enhancements (network error recovery, polling conflict
detection, DM topics setup).

Co-authored-by: SHL0MS <SHL0MS@users.noreply.github.com>

* fix: send_document call in background task delivery + vision download timeout

Two fixes salvaged from PR #2269 by amethystani:

1. gateway/run.py: adapter.send_file() → adapter.send_document()
   send_file() doesn't exist on BasePlatformAdapter. Background task
   media files were silently never delivered (AttributeError swallowed
   by except Exception: pass).

2. tools/vision_tools.py: configurable image download timeout via
   HERMES_VISION_DOWNLOAD_TIMEOUT env var (default 30s), plus guard
   against raise None when max_retries=0.

The third fix in #2269 (opencode-go auth config) was already resolved
on main.

Co-authored-by: amethystani <amethystani@users.noreply.github.com>

---------

Co-authored-by: SHL0MS <SHL0MS@users.noreply.github.com>
Co-authored-by: amethystani <amethystani@users.noreply.github.com>
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@ -1018,7 +1018,8 @@ auxiliary:
model: "" # e.g. "openai/gpt-4o", "google/gemini-2.5-flash"
base_url: "" # Custom OpenAI-compatible endpoint (overrides provider)
api_key: "" # API key for base_url (falls back to OPENAI_API_KEY)
timeout: 30 # seconds — increase for slow local vision models
timeout: 30 # seconds — LLM API call; increase for slow local vision models
download_timeout: 30 # seconds — image HTTP download; increase for slow connections
# Web page summarization + browser page text extraction
web_extract:
@ -1042,7 +1043,7 @@ auxiliary:
```
:::tip
Each auxiliary task has a configurable `timeout` (in seconds). Defaults: vision 30s, web_extract 30s, approval 30s, compression 120s. Increase these if you use slow local models for auxiliary tasks.
Each auxiliary task has a configurable `timeout` (in seconds). Defaults: vision 30s, web_extract 30s, approval 30s, compression 120s. Increase these if you use slow local models for auxiliary tasks. Vision also has a separate `download_timeout` (default 30s) for the HTTP image download — increase this for slow connections or self-hosted image servers.
:::
:::info