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/test-stubs/react-native-unistyles.ts

@@ -0,0 +1,51 @@
+const testTheme = {
+  colorScheme: "light",
+  colors: {
+    foreground: "#111111",
+    foregroundMuted: "#666666",
+    statusSuccess: "#15803d",
+    statusDanger: "#b91c1c",
+    statusWarning: "#d97706",
+    statusMerged: "#7c3aed",
+    surface1: "#fafafa",
+    surface2: "#f4f4f5",
+    border: "#e4e4e7",
+  },
+  spacing: [0, 4, 8, 12, 16, 20, 24, 28, 32],
+  fontSize: {
+    xs: 12,
+    sm: 14,
+  },
+  fontWeight: {
+    normal: "400",
+    medium: "500",
+  },
+  borderRadius: {
+    base: 4,
+    md: 6,
+  },
+};
+
+type StyleFactory<T> = (theme: typeof testTheme) => T;
+
+function isStyleFactory<T>(styles: T | StyleFactory<T>): styles is StyleFactory<T> {
+  return typeof styles === "function";
+}
+
+export const StyleSheet = {
+  create: <T>(styles: T | StyleFactory<T>): T =>
+    isStyleFactory(styles) ? styles(testTheme) : styles,
+};
+
+export const withUnistyles = <T>(Component: T): T => Component;
+
+export const useUnistyles = () => ({
+  theme: testTheme,
+  rt: {},
+  breakpoint: undefined,
+});
+
+export const UnistylesRuntime = {
+  setTheme: () => undefined,
+  themeName: "light",
+};