docs: fix 30+ inaccuracies across documentation (#9023)

Cross-referenced all docs pages against the actual codebase and fixed:

Reference docs (cli-commands.md, slash-commands.md, profile-commands.md):
- Fix: hermes web -> hermes dashboard (correct subparser name)
- Fix: Wrong provider list (removed deepseek, ai-gateway, opencode-zen,
  opencode-go, alibaba; added gemini)
- Fix: Missing tts in hermes setup section choices
- Add: Missing --image flag for hermes chat
- Add: Missing --component flag for hermes logs
- Add: Missing CLI commands: debug, backup, import
- Fix: /status incorrectly marked as messaging-only (available everywhere)
- Fix: /statusbar moved from Session to Configuration category
- Add: Missing slash commands: /fast, /snapshot, /image, /debug
- Add: Missing /restart from messaging commands table
- Fix: /compress description to match COMMAND_REGISTRY
- Add: --no-alias flag to profile create docs

Configuration docs (configuration.md, environment-variables.md):
- Fix: Vision timeout default 30s -> 120s
- Fix: TTS providers missing minimax and mistral
- Fix: STT providers missing mistral
- Fix: TTS openai base_url shown with wrong default
- Fix: Compression config showing stale summary_model/provider/base_url
  keys (migrated out in config v17) -> target_ratio/protect_last_n

Getting-started docs:
- Fix: Redundant faster-whisper install (already in voice extra)
- Fix: Messaging extra description missing Slack

Developer guide:
- Fix: architecture.md tool count 48 -> 47, toolset count 40 -> 19
- Fix: run_agent.py line count 9,200 -> 10,700
- Fix: cli.py line count 8,500 -> 10,000
- Fix: main.py line count 5,500 -> 6,000
- Fix: gateway/run.py line count 7,500 -> 9,000
- Fix: Browser tools count 11 -> 10
- Fix: Platform adapter count 15 -> 18 (add wecom_callback, api_server)
- Fix: agent-loop.md wrong budget sharing (not shared, independent)
- Fix: agent-loop.md non-existent _get_budget_warning() reference
- Fix: context-compression-and-caching.md non-existent function name
- Fix: toolsets-reference.md safe toolset includes mixture_of_agents (it doesn't)
- Fix: toolsets-reference.md hermes-cli tool count 38 -> 36

Guides:
- Fix: automate-with-cron.md claims daily at 9am is valid (it's not)
- Fix: delegation-patterns.md Max 3 presented as hard cap (configurable)
- Fix: sessions.md group thread key format (shared by default, not per-user)
- Fix: cron-internals.md job ID format and JSON structure

website/docs/developer-guide/context-compression-and-caching.md

@@ -53,7 +53,7 @@ Hermes has two separate compression layers that operate independently:
 
 ### 1. Gateway Session Hygiene (85% threshold)
 
-Located in `gateway/run.py` (search for `_maybe_compress_session`). This is a **safety net** that
+Located in `gateway/run.py` (search for `Session hygiene: auto-compress`). This is a **safety net** that
 runs before the agent processes a message. It prevents API failures when sessions
 grow too large between turns (e.g., overnight accumulation in Telegram/Discord).