chore: infra hardening — CodeQL fix, SLSA L3, multi-arch Docker, action pins, NTC cleanup

[navidrast]

Summary

Seven commits that close P0 / P1 items from the public-readiness audit. Every change lands in workflow, Docker, release config, plugin manifests, or PWA metadata — zero business-logic code touched, zero API contracts changed, zero data-format shifts.

Chained on top of PR #6 (chore/public-readiness-p0 as base). Once #6 merges, retarget this PR to main with gh pr edit <N> --base main.

Commits (top-down, each independently reviewable)

1. fix(ci): unbreak CodeQL by removing Flutter build + pinning to v3.35.2
   CodeQL has failed 5/5 recent runs on main. Two compounding causes: Flutter build step + ambiguous @v3 pin. Replace the Flutter build with a single-line app/build/web/index.html placeholder (so //go:embed all:build/web resolves for go build) and pin the three codeql-action steps to v3.35.2. Note: SARIF upload also requires GitHub Advanced Security to be enabled on the repo settings — that's a parallel admin action.

2. chore(ci): align Go toolchain version to 1.25.6 everywhere
   go.mod and all GitHub workflows were on 1.25. Dockerfile was on 1.24 and Gitea deploy on 1.22.5. Release binaries were built with a patch-lagged toolchain. Bump to 1.25.

3. chore(ci): add least-privilege permissions blocks to unscoped workflows
   ci.yml / dco.yml / tag-protection.yml had no explicit permissions: block → GITHUB_TOKEN defaulted to repo-wide write. Add minimal scoped blocks. Expected OSSF Scorecard impact: Token-Permissions moves from fail to pass.

4. feat(release): SLSA L3 provenance attestation + SHA256SUMS checksums
   Add actions/attest-build-provenance@v4.1.0 after goreleaser → every release archive carries an .intoto.jsonl attestation binding binary ← commit ← workflow run. Also make the goreleaser checksum: section explicit (SHA256SUMS) so install.sh's existing SHA-256 verify path has a guaranteed file name.

5. feat(docker): multi-arch image (linux/amd64 + linux/arm64) via buildx
   Docker image shipped amd64-only → "exec format error" on Apple Silicon, Raspberry Pi, ARM VPS. Add docker/setup-qemu-action + docker/setup-buildx-action@v4.0.0, set platforms: linux/amd64,linux/arm64, turn on GHA layer cache (~2-3 min saved per tag).

6. chore(ci): pin third-party actions to tagged patch versions
   Every non-actions/*, non-github/* third-party action pinned to a patch tag. Covers subosito/flutter-action, goreleaser-action, sigstore/cosign-installer, anchore/sbom-action, codecov-action, docker/setup-qemu, docker/login, docker/metadata, docker/build-push, googleapis/release-please, pozil/auto-assign-issue. actions/* left at major per Scorecard guidance (trusted first-party).

7. fix: rename remaining NTC leftovers + replace Flutter template defaults
   Anomaly sweep found six string-only leftovers — three user-visible bugs, three cosmetic:

   • plugins/builtin/telegram/manifest.json declared envVar: NTC_TELEGRAM_BOT_TOKEN but the Go fallback reads OPENDRAY_TELEGRAM_BOT_TOKEN → silent no-op for users following documented env var. Manifest now matches code.
   • app/web/manifest.json was the pristine Flutter create template (name: "ntc", description: "A new Flutter project.", Flutter-blue theme) → rewritten with product name, tagline, brand palette.
   • app/web/index.html same — HTML <title>, iOS web-app-title, meta description all said "ntc" → now "OpenDray".
   • plugins/builtin/opencode/manifest.json description: "NTC host" → "OpenDray host".
   • gateway/simulator.go iOS screenshot temp path: /tmp/ntc_sim_*.png → /tmp/opendray_sim_*.png. Verified single write site + same-function read+delete; zero external dependency.
   • Android android:label: "opendray" (lowercase) → "OpenDray" to match iOS CFBundleDisplayName.
     Intentionally NOT touched: SQL migration comments, Go comment example paths, docs/plugin-platform/M3-RELEASE.md lineage notes — these are archival / historical context with no user visibility. Go module path github.com/opendray/opendray stays lowercase (Go modules case-sensitive; current is correct).

Scope audit (what this PR does NOT touch)

• ❌ No .go business-logic code
• ❌ No API routes, request/response shapes, or WebSocket protocols
• ❌ No database schema or migrations
• ❌ No config-file format changes (existing config.toml, .env, plugin-config DB entries still work)
• ❌ No tests added, removed, or changed
• ❌ No runtime behaviour change on any path an existing deployment depends on

Test plan

• go build ./... clean
• go vet ./... clean
• -race test suite — no regressions (known pre-existing flaky TestRunner_EchoSucceeds was fixed upstream on main; 3 "failing" test suites earlier flagged were environmental, all pass with clean env)
• All 3 modified JSON files (app/web/manifest.json, plugins/builtin/{telegram,opencode}/manifest.json) re-parse as valid JSON
• PR diff is 17 files, +86/-35 lines — every line hand-reviewed
• Admin-side (@navidrast): enable GitHub Advanced Security in Settings → Code Security & Analysis (unlocks CodeQL SARIF upload; free on public plan)
• Post-merge: next tag push should produce: SHA256SUMS, .intoto.jsonl attestations, multi-arch Docker manifest (verify: docker manifest inspect ghcr.io/opendray/opendray:<tag> shows amd64 + arm64)

Projected OSSF Scorecard impact

Check	Before	After
Token-Permissions	fail	pass
SLSA	fail	pass
SAST	fail	pass*
Pinned-Dependencies	partial	near-complete
Signed-Releases	pass	pass
Total estimate	~7/17	~11–12/17

*SAST pass conditional on Advanced Security being enabled in repo settings.

Related

• Closes C8-01 through C8-06 and X-01, X-02, X-03, X-04, X-11 from /mnt/nas/OpenDray/8-of-10-action-plan.md.
• Closes the 3 user-visible bugs and 3 cosmetic NTC leftovers flagged in the anomaly rescan.
• Depends on PR chore: public-readiness P0 — CORS/WS lockdown, NTC rename, action pinning, badge casing #6.

Merge strategy

Rebase and merge — each commit has a distinct Conventional-Commit prefix that release-please will parse into individual CHANGELOG entries. Do NOT squash (would flatten 7 meaningful entries into 1).

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