feat: make standalone Console canonical

[XnLemon]

Outcome

Make NeKiro-Console the canonical production Console before the core repository removes apps/console under NeKiro issue #80.

Changes

• syncs the latest reviewed Console implementation from core, including Public Agent Share URLs, exact Release installation, strict API/config mapping, and state/concurrency fixes;
• adds the missing public share page, install panel, URL parser, and tests;
• removes the unused src/data.ts narrative constants;
• identifies the package as @nekiro/console with pnpm 11.3;
• rewrites CI as workflow CI with pinned Actions and quality, build, security, and aggregate required jobs;
• removes the fixed-SHA checkout of the core repository and all Compose assembly from Console CI;
• documents NeKiro-Stack as the owner of complete backend/browser product acceptance.

The Playwright suite remains in this repository as Console-owned browser behavior. Stack will check out an exact Console commit and invoke it against an immutable product manifest.

Verification

• pnpm install --frozen-lockfile
• pnpm typecheck
• pnpm test (48 passed)
• pnpm build
• workflow YAML parse
• license, credential-material, and cross-repository checkout scans
• git diff --check

Fallback delta: removed the copied-core CI checkout path (1), retained 0, added 0, net -1.

Added fallback evidence: none.