feat(dashboard): full-featured profile builder (model + skills + MCPs) (#39084)

* feat(profiles): extend create endpoint for full profile-builder (model + MCPs + skills)

Backend foundation for the dashboard profile builder. Extends POST /api/profiles
to accept, in one call, everything a profile needs beyond name/clone:

- mcp_servers[]  -> written into the new profile's config.yaml
- keep_skills[]  -> replace-semantics: disable every seeded skill not kept
- hub_skills[]   -> async install via 'hermes -p <name> skills install <id>'

All applied best-effort AFTER the profile dir exists, so a hiccup in any one
never 500s the create. Model/MCP/keep-skills writes are profile-scoped via the
HERMES_HOME context override (same mechanism as the existing _write_profile_model).
Hub installs go through a subprocess scoped with -p because skills_hub.SKILLS_DIR
is import-time-bound and the runtime override can't redirect it.

Adds two helpers (_write_profile_mcp_servers, _disable_unselected_skills) and a
TestClient test asserting all four paths land in the NEW profile's config and
the hub spawn is scoped to it. Design doc at docs/design/profile-builder.md.

* feat(dashboard): full-featured profile builder page

Adds a dedicated /profiles/new builder that composes everything a profile
needs into one stepped create flow, reusing the existing Models/Skills/MCP
data paths instead of duplicating them:

- Identity   name + description
- Model      provider+model picker (api.getModelOptions)
- Skills     keep-which-built-in/optional (replace semantics, default = full
             bundle) + skills-hub search/add (api.getSkills, searchSkillsHub)
- MCPs       add HTTP/stdio servers inline
- Review     blueprint -> single POST /api/profiles create

Nothing writes until Create; the one call commits model+MCPs+skill selection
and spawns hub-skill installs (reported in the success toast). ProfilesPage
header gets a 'Build' button (full builder) alongside 'Create' (quick modal).
Route is page-only (not in the sidebar nav). Verified with vite build (2258
modules, green).

web/src/lib/api.ts

@@ -439,8 +439,19 @@ export const api = {
     description?: string;
     provider?: string;
     model?: string;
+    mcp_servers?: McpServerCreate[];
+    keep_skills?: string[];
+    hub_skills?: string[];
   }) =>
-    fetchJSON<{ ok: boolean; name: string; path: string; model_set?: boolean }>("/api/profiles", {
+    fetchJSON<{
+      ok: boolean;
+      name: string;
+      path: string;
+      model_set?: boolean;
+      mcp_written?: number;
+      skills_disabled?: number;
+      hub_installs?: Array<{ identifier: string; pid: number | null }>;
+    }>("/api/profiles", {
       method: "POST",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify(body),