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>

README.md

@@ -13,18 +13,24 @@ learns from outcomes, and escalates when uncertain.
 ## Quick start
 
 ```bash
-# Dev stack (postgres + api + scheduler + notifier)
-docker compose --profile dev up -d
+# Dev stack (postgres + api + scheduler + notifier). The api/nomos
+# services need a shared token — every route requires a real bearer
+# credential, there's no dev-open bypass.
+OIKOS_MCP_BEARER_TOKEN=dev-token docker compose --profile dev up -d
 
 # Full stack (adds Nomos agent gateway)
-docker compose --profile full up -d
+OIKOS_MCP_BEARER_TOKEN=dev-token docker compose --profile full up -d
 
 # Build standalone binary
 go build -o bin/oikos -tags timetzdata ./cmd/oikos
 
 # Run all roles in one process (dev mode)
 OIKOS_DATABASE_URL="postgres://oikos:oikos_dev@localhost:5432/oikos?sslmode=disable" \
+  OIKOS_API_TOKEN=dev-token \
   go run ./cmd/oikos all
+
+# Control-room SPA (separate from the Go binary — see web/)
+cd web && OIKOS_API_TOKEN=dev-token npm run dev   # http://localhost:5173
 ```
 
 ## Architecture
@@ -66,9 +72,12 @@ Full plan: [plans/2026-07-06-consolidate-oikos-control-plane-onto-mac-mini.md](p
 ### API endpoints
 
 ```bash
-curl http://localhost:8090/api/v1/entities?type=service  # fleet
-curl http://localhost:8090/api/v1/health                  # fleet health
-curl http://localhost:8090/api/v1/agent-activity          # agent log
+curl -H "Authorization: Bearer $OIKOS_API_TOKEN" \
+  http://localhost:8090/api/v1/entities?type=service  # fleet
+curl -H "Authorization: Bearer $OIKOS_API_TOKEN" \
+  http://localhost:8090/api/v1/health                  # fleet health
+curl -H "Authorization: Bearer $OIKOS_API_TOKEN" \
+  http://localhost:8090/api/v1/agent-activity          # agent log
 ```
 
 ### Nomos queries
@@ -97,6 +106,15 @@ oikos secret list # enumerate SOPS secrets
 oikos secret migrate  # SOPS → Infisical
 ```
 
+### Web UI
+
+`web/` is a standalone Svelte 5 SPA — not embedded in the `oikos` binary, not
+part of `docker-compose.yml`. It talks to `api`/`nomos` over HTTP with a
+bearer token entered on first launch (see `web/src/pages/Config.svelte`).
+Build with `make ui`, deploy with `make deploy-ui` (Caddy serves the static
+output). A native desktop wrapper is planned — see
+[plans/2026-07-12-wails-desktop-app.md](plans/2026-07-12-wails-desktop-app.md).
+
 ## Repo layout
 
 ```
@@ -105,6 +123,7 @@ cmd/nomos/          Nomos MCP client gateway
 internal/           Go packages (httpapi, mcp, scheduler, actuator, learning,
                     notifier, policy, secrets, db, config, ontology, domain,
                     knowledge)
+web/                Control-room SPA (Svelte 5) — standalone, not embedded
 api/openapi.yaml    API contract (OpenAPI 3.1)
 migrations/         Forward-only SQL migrations (TimescaleDB)
 seeds/              Bootstrap YAML (ontology, inventory, policy, knowledge)