docs: comprehensive update for recent merged PRs (#9019)

Audit and update documentation across 12 files to match changes from
~50 recently merged PRs. Key updates:

Slash commands (slash-commands.md):
- Add 5 missing commands: /snapshot, /fast, /image, /debug, /restart
- Fix /status incorrectly labeled as messaging-only (available in both)
- Add --global flag to /model docs
- Add [focus topic] arg to /compress docs

CLI commands (cli-commands.md):
- Add hermes debug share section with options and examples
- Add hermes backup section with --quick and --label flags
- Add hermes import section

Feature docs:
- TTS: document global tts.speed and per-provider speed for Edge/OpenAI
- Web dashboard: add docs for 5 missing pages (Sessions, Logs,
  Analytics, Cron, Skills) and 15+ API endpoints
- WhatsApp: add streaming, 4K chunking, and markdown formatting docs
- Skills: add GitHub rate-limit/GITHUB_TOKEN troubleshooting tip
- Budget: document CLI notification on iteration budget exhaustion

Config migration (compression.summary_* → auxiliary.compression.*):
- Update configuration.md, environment-variables.md,
  fallback-providers.md, cli.md, and context-compression-and-caching.md
- Replace legacy compression.summary_model/provider/base_url references
  with auxiliary.compression.model/provider/base_url
- Add legacy migration info boxes explaining auto-migration

Minor fixes:
- wecom-callback.md: clarify 'text only' limitation (input only)
- Escape {session_id}/{job_id} in web-dashboard.md headings for MDX

website/docs/user-guide/features/tts.md

@@ -36,8 +36,10 @@ Convert text to speech with six providers:
 # In ~/.hermes/config.yaml
 tts:
   provider: "edge"              # "edge" | "elevenlabs" | "openai" | "minimax" | "mistral" | "neutts"
+  speed: 1.0                    # Global speed multiplier (provider-specific settings override this)
   edge:
     voice: "en-US-AriaNeural"   # 322 voices, 74 languages
+    speed: 1.0                  # Converted to rate percentage (+/-%)
   elevenlabs:
     voice_id: "pNInz6obpgDQGcFmaJgB"  # Adam
     model_id: "eleven_multilingual_v2"
@@ -45,6 +47,7 @@ tts:
     model: "gpt-4o-mini-tts"
     voice: "alloy"              # alloy, echo, fable, onyx, nova, shimmer
     base_url: "https://api.openai.com/v1"  # Override for OpenAI-compatible TTS endpoints
+    speed: 1.0                  # 0.25 - 4.0
   minimax:
     model: "speech-2.8-hd"     # speech-2.8-hd (default), speech-2.8-turbo
     voice_id: "English_Graceful_Lady"  # See https://platform.minimax.io/faq/system-voice-id
@@ -61,6 +64,8 @@ tts:
     device: cpu
 ```
 
+**Speed control**: The global `tts.speed` value applies to all providers by default. Each provider can override it with its own `speed` setting (e.g., `tts.openai.speed: 1.5`). Provider-specific speed takes precedence over the global value. Default is `1.0` (normal speed).
+
 ### Telegram Voice Bubbles & ffmpeg
 
 Telegram voice bubbles require Opus/OGG audio format: