feat(PRLT-1326): add prlt notion connect/disconnect

[chrismcdermut]

Summary

Adds prlt notion connect and prlt notion disconnect commands. Once connected, resolveTicketProvider() returns the existing NotionTicketProvider so all ticket operations (prlt ticket list, prlt work start, the daemon poller) read/write Notion live — no import or sync.

What's in this PR

• apps/cli/src/commands/notion/connect.ts — interactive integration-token auth, --check health probe, --force re-auth, --database <id> non-interactive picker, JSON-mode prompt config for agents.
• apps/cli/src/commands/notion/disconnect.ts — clears notion.api_key from the credentials DB and removes the notion provider source.
• apps/cli/src/lib/notion/client.ts — adds searchDatabases(query?) against /v1/search (filters to object: database).
• Registers a notion provider source on connect so multi-source routing picks up Notion.
• apps/cli/test/unit/notion-connect.test.ts — covers config persist/clear, env-var precedence, provider-source removal on disconnect, and searchDatabases request shape + error handling.

Test plan

• `pnpm build` clean
• `notion-connect.test.ts` — 9/9 passing
• `notion-provider.test.ts` — 38/38 passing (no regressions)
• `prlt notion --help` and subcommand help render correctly

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