feat(web): split SPA from oikos binary, require auth on every route

Phase 0 of plans/2026-07-12-wails-desktop-app.md. The control-room SPA
is no longer embedded (web/embed.go deleted); it's a standalone static
build served separately (make ui / make deploy-ui). The api process
adds CORS and drops the dev-open auth bypass — every route now needs a
real bearer token, including SSE (?token= query param, EventSource
can't set headers) and api's own /agent proxy to nomos (previously
unauthenticated by omission).

nomos was an unauthenticated client of api's /mcp and approval-decision
endpoints; closing dev-open would have broken it, so it now sends
Authorization: Bearer $OIKOS_MCP_BEARER_TOKEN on every call back to api.

SPA gets a runtime config module (config.ts) and a Config.svelte
first-launch/reconfigure page, reachable afterwards via a "Connection"
entry in the sidebar footer. Every fetch() in api.ts routes through
fetchWithAuth so the same build works same-origin (browser prod, Vite
dev proxy) or cross-origin (future Wails webview, remote access).

Six gaps found against the plan and the live Caddy topology while
implementing — documented in the plan's "Plan review" section, most
notably: api's own /agent mount was never behind combinedAuth (fixed),
and production's Authentik forward-auth needs a bearer-token bypass for
API routes that this repo's Caddyfile.oikos reference copy now has, but
the real dtoro/caddy-conf deploy does not yet.

Verified live: cross-origin static SPA + API, CORS, bearer auth, SSE
query-token auth, and localStorage persistence all confirmed working
in-browser. Full Go test suite and npm run build pass with no
regressions against the pre-change baseline.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/httpapi/api_test.go

@@ -93,15 +93,34 @@ func newTestHandler(t *testing.T, cfg config.Config) http.Handler {
 		}
 	}
 
-	return NewHandler(handlerCtx, pool, cfg, nil)
+	return NewHandler(handlerCtx, pool, cfg)
+}
+
+// testAuthToken is the static bearer token devConfig() configures. There is
+// no dev-open bypass (removed — plans/2026-07-12-wails-desktop-app.md 0.4),
+// so every test handler needs a real credential; get/postJSON/do inject it
+// by default. Pass an explicit "" value for "Authorization" in headers to
+// test the no-credential path.
+const testAuthToken = "test-dev-token"
+
+// applyHeaders sets req's default Authorization header, then layers headers
+// on top. A "" value deletes the header instead of setting it, so tests can
+// exercise the missing-credential case.
+func applyHeaders(req *http.Request, headers map[string]string) {
+	req.Header.Set("Authorization", "Bearer "+testAuthToken)
+	for k, v := range headers {
+		if v == "" {
+			req.Header.Del(k)
+		} else {
+			req.Header.Set(k, v)
+		}
+	}
 }
 
 func get(t *testing.T, h http.Handler, path string, headers map[string]string) (*httptest.ResponseRecorder, map[string]any) {
 	t.Helper()
 	req := httptest.NewRequest("GET", path, nil)
-	for k, v := range headers {
-		req.Header.Set(k, v)
-	}
+	applyHeaders(req, headers)
 	rec := httptest.NewRecorder()
 	h.ServeHTTP(rec, req)
 	var body map[string]any
@@ -113,6 +132,7 @@ func postJSON(t *testing.T, h http.Handler, path string, payload string) (*httpt
 	t.Helper()
 	req := httptest.NewRequest("POST", path, strings.NewReader(payload))
 	req.Header.Set("Content-Type", "application/json")
+	applyHeaders(req, nil)
 	rec := httptest.NewRecorder()
 	h.ServeHTTP(rec, req)
 	var body map[string]any
@@ -122,7 +142,8 @@ func postJSON(t *testing.T, h http.Handler, path string, payload string) (*httpt
 
 func devConfig() config.Config {
 	c := config.Default()
-	c.APIEnv = "dev" // no tokens → dev-open auth
+	c.APIEnv = "dev"
+	c.APIToken = testAuthToken
 	return c
 }
 
@@ -295,7 +316,7 @@ func TestAPIBearerAuth(t *testing.T) {
 	}
 
 	// API requires the token
-	rec, body := get(t, h, "/api/v1/entities", nil)
+	rec, body := get(t, h, "/api/v1/entities", map[string]string{"Authorization": ""})
 	if rec.Code != 401 {
 		t.Errorf("no token = %d, want 401 (%v)", rec.Code, body)
 	}