feat(forge): pluggable forge abstraction + GitLab and Gitea/Forgejo/Codeberg (#1913)

* refactor(forge): forge-neutral foundation (GitHub-only)

Decouple git-hosting from GitHub behind a neutral abstraction (issue #1616), GitHub-only for now; existing GitHub behaviour is unchanged.

- Forge manifest, neutral ForgeService contract, forge registry + resolver, and a client forge-module registry.
- GitHub code renamed to the neutral shape; PR/Issue attachment wording preserved.
- forge.search.response enums parse tolerantly (unknown kind/auth state degrade instead of breaking the client).
- createPullRequest reports typed CLI/auth errors instead of a generic message.
- forge-resolver host/remote caches are LRU-bounded.
- Forge host trust is explicit: only a known cloud host or a CLI-authenticated host is ever talked to; an unauthenticated GitHub Enterprise host fails resolution instead of routing to github.com.
- Docs: forge-providers guide, glossary and i18n forge-copy conventions, architecture and rpc-namespacing terminology.
- Vitest React Native mocks (unistyles, svg, linking, lucide) consolidated into shared aliased test-stubs.

* feat(forge): GitLab adapter, forge-aware UI, pipelines and approvals

GitLab adapter over the glab CLI on the neutral contracts: MR status, forge-aware UI, pipeline tree, and N-of-M approvals.

- threadIsResolved is part of the neutral timeline item.
- Pipeline load failures show an error instead of an empty section.
- Manual pipeline jobs render as pending.
- Fork/detached MR head pipelines are fetched by MR iid (glab ci get --merge-request).

* feat(forge): Gitea family adapter (Gitea, Forgejo, Codeberg)

One adapter over the tea CLI serving Gitea, Forgejo, and Codeberg on the neutral contracts.

- CI status aggregates commit statuses and Actions runs together.
- Gitea's terminal "warning" state maps to failure on server and client.
- Gitea Actions check details are reachable from the PR pane by workflowRunId.

* refactor(forge): localize compatibility handling

* test(forge): expect normalized GitLab facts

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/i18n/resources.test.ts

@@ -194,7 +194,10 @@ describe("translation resources", () => {
     expect(en.composer.input.sendMessage).toBe("Send message");
     expect(en.composer.voice.startDictation).toBe("Start dictation");
     expect(en.composer.attachments.addIssueOrPr).toBe("Add issue or PR");
+    expect(en.composer.attachments.addIssueOrPr_mr).toBe("Add issue or MR");
     expect(en.composer.github.title).toBe("Attach issue or PR");
+    expect(en.composer.github.title_mr).toBe("Attach issue or MR");
+    expect(en.composer.github.searchPlaceholder_mr).toBe("Search issues and MRs...");
     expect(en.agentControls.provider.fallback).toBe("Provider");
     expect(en.agentControls.hints.model).toBe("Change model");
     expect(en.agentControls.hints.mode).toBe("Change mode");
@@ -258,7 +261,14 @@ describe("translation resources", () => {
     expect(en.workspace.git.actions.commit.label).toBe("Commit");
     expect(en.workspace.git.diff.binaryFile).toBe("Binary file");
     expect(en.workspace.git.pr.sections.checks).toBe("Checks");
+    expect(en.workspace.git.pr.sections.pipeline).toBe("Pipeline");
     expect(en.workspace.git.pr.actions.viewPullRequest).toBe("View");
+    expect(en.workspace.git.pr.actions.openOn).toBe("Open on {{brand}}");
+    expect(en.workspace.git.pr.empty.noJobs).toBe("No jobs");
+    expect(en.workspace.git.pr.empty.loadingPipeline).toBe("Loading pipeline…");
+    expect(en.workspace.git.pr.empty.pipelineJobsLoadFailed).toBe("Could not load pipeline jobs");
+    expect(en.workspace.git.pr.empty.allowedToFail).toBe("allowed to fail");
+    expect(en.workspace.git.pr.approvals).toBe("{{given}} of {{required}} approvals");
     expect(en.review.comment.placeholder).toBe("Leave a comment");
   });