docs: improve README positioning and refresh hero screenshots (#5)

* docs: rewrite README around first-run value and support positioning

* docs: add screenshot refresh brief and trim README repetition

* docs: refresh README hero screenshots

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Co-authored-by: Tao <dtzp555@gmail.com>

docs/SCREENSHOT_REFRESH_BRIEF.md

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+# OCM Screenshot Refresh Brief
+
+Goal: refresh only the highest-value README screenshots first, not every screenshot.
+
+## Redaction rules
+Always hide or blur:
+- Telegram / Discord IDs
+- bindings / peer IDs / thread IDs
+- local filesystem paths containing Tao's name
+- account labels if they expose personal identifiers
+- anything that looks like a secret/token
+
+## Priority 1 screenshots
+
+### 1) Dashboard hero
+Purpose:
+- show OCM as a real control panel
+- support the README first-run / health story
+
+Wanted state:
+- Dashboard page open
+- gateway looks healthy if possible
+- cards readable
+- top bar clean
+- no obvious warning/noise unless it helps credibility
+
+Frame guidance:
+- browser window wide enough to show full dashboard naturally
+- keep top navigation visible
+- avoid cropping too tightly
+
+### 2) Agents page
+Purpose:
+- show the core product value: visible agent topology / structure
+
+Wanted state:
+- main agent + several sub-agents visible
+- structure easy to understand at a glance
+- avoid visual clutter where possible
+- keep model selectors/buttons visible, but not the focus
+
+Frame guidance:
+- enough width to show the tree clearly
+- IDs and personal paths redacted
+
+### 3) CLI / Terminal page
+Purpose:
+- show that OCM is not only a viewer; it can operate OpenClaw too
+
+Wanted state:
+- built-in terminal open
+- a real command visible (recommended: `openclaw status` or `openclaw doctor`)
+- real output visible
+- do not use tutorial arrows / annotation bubbles
+
+Frame guidance:
+- include command input and some output
+- avoid empty terminal state
+- redact paths / personal names
+
+## Priority 2 screenshots
+- Actions menu
+- Backup / rollback
+- Channels
+- Models
+- Auth
+- Cron
+- Stats
+
+## Selected refresh set (2026-03-07)
+- Dashboard: `docs/redacted-screenshots-refresh/dashboard-2026-03-07.jpg`
+- Agents: `docs/redacted-screenshots-refresh/agents-2026-03-07.jpg`
+- CLI: `docs/redacted-screenshots-refresh/cli-2026-03-07.jpg`
+- Keep using existing `docs/redacted-screenshots/actions.jpg` for now
+
+## Notes
+- Existing `actions.jpg` is already strong and can stay for now.
+- The new Dashboard and Agents captures are preferred for README hero/overview use.
+- The new CLI capture is preferred because it shows a real command and real output.