chore: remove unused desktop app, cloud deployment infra, and monitoring stack

Deletes desktop/ (Electron wrapper), deployments/ (Helm/Kustomize/
Terraform/CI for cloud deploy), and monitoring/ (Prometheus + Grafana
stack) along with DESKTOP.md, DEPLOYMENT.md, docker-compose.full.yml,
their npm scripts, and every dangling reference across README,
ARCHITECTURE, INSTALL, SETUP, docs/, and the repeated per-file
MODULE_GUIDE "Observability" boilerplate comment. The GET /api/metrics
endpoint itself is untouched — it's the dashboard's own route, not
part of the removed monitoring stack.

client/src/components/conversation/CodeBlock.tsx

@@ -22,11 +22,6 @@
  * how to reach a peer dashboard; the global data scope (`dataScope.ts`) narrows every
  * scoped GET via `?sources=`. Health checks and import history surface in Settings.
  *
- * ## Observability
- * Prometheus scrapes `GET /api/metrics` (see `monitoring/`). Grafana ships four
- * provisioned boards (overview, sessions, tools, alerts). Native npm scripts and
- * Docker Compose profiles are documented in `monitoring/README.md`.
- *
  * ## Internal dependencies
  * - `../../lib/highlight`
  *

client/src/components/conversation/ConversationView.tsx

@@ -25,11 +25,6 @@
  * how to reach a peer dashboard; the global data scope (`dataScope.ts`) narrows every
  * scoped GET via `?sources=`. Health checks and import history surface in Settings.
  *
- * ## Observability
- * Prometheus scrapes `GET /api/metrics` (see `monitoring/`). Grafana ships four
- * provisioned boards (overview, sessions, tools, alerts). Native npm scripts and
- * Docker Compose profiles are documented in `monitoring/README.md`.
- *
  * ## Internal dependencies
  * - `../../lib/api`
  * - `../../lib/eventBus`

client/src/components/conversation/MarkdownContent.tsx

@@ -29,11 +29,6 @@
  * how to reach a peer dashboard; the global data scope (`dataScope.ts`) narrows every
  * scoped GET via `?sources=`. Health checks and import history surface in Settings.
  *
- * ## Observability
- * Prometheus scrapes `GET /api/metrics` (see `monitoring/`). Grafana ships four
- * provisioned boards (overview, sessions, tools, alerts). Native npm scripts and
- * Docker Compose profiles are documented in `monitoring/README.md`.
- *
  * ## Internal dependencies
  * - `./CodeBlock`
  *

client/src/components/conversation/MessageList.tsx

@@ -24,11 +24,6 @@
  * how to reach a peer dashboard; the global data scope (`dataScope.ts`) narrows every
  * scoped GET via `?sources=`. Health checks and import history surface in Settings.
  *
- * ## Observability
- * Prometheus scrapes `GET /api/metrics` (see `monitoring/`). Grafana ships four
- * provisioned boards (overview, sessions, tools, alerts). Native npm scripts and
- * Docker Compose profiles are documented in `monitoring/README.md`.
- *
  * ## Internal dependencies
  * - `../../lib/types`
  * - `./ToolCallBlock`

client/src/components/conversation/ToolCallBlock.tsx

@@ -24,11 +24,6 @@
  * how to reach a peer dashboard; the global data scope (`dataScope.ts`) narrows every
  * scoped GET via `?sources=`. Health checks and import history surface in Settings.
  *
- * ## Observability
- * Prometheus scrapes `GET /api/metrics` (see `monitoring/`). Grafana ships four
- * provisioned boards (overview, sessions, tools, alerts). Native npm scripts and
- * Docker Compose profiles are documented in `monitoring/README.md`.
- *
  * ## Internal dependencies
  * - `../../lib/types`
  * - `./CodeBlock`

client/src/components/conversation/toolStyle.ts

@@ -22,11 +22,6 @@
  * how to reach a peer dashboard; the global data scope (`dataScope.ts`) narrows every
  * scoped GET via `?sources=`. Health checks and import history surface in Settings.
  *
- * ## Observability
- * Prometheus scrapes `GET /api/metrics` (see `monitoring/`). Grafana ships four
- * provisioned boards (overview, sessions, tools, alerts). Native npm scripts and
- * Docker Compose profiles are documented in `monitoring/README.md`.
- *
  * ## Public surface
  * - `ToolStyle` — exported API; see TSDoc on the symbol for behavior.
  * - `styleForTool` — exported API; see TSDoc on the symbol for behavior.

client/src/components/conversation/tuiSegments.ts

@@ -24,11 +24,6 @@
  * how to reach a peer dashboard; the global data scope (`dataScope.ts`) narrows every
  * scoped GET via `?sources=`. Health checks and import history surface in Settings.
  *
- * ## Observability
- * Prometheus scrapes `GET /api/metrics` (see `monitoring/`). Grafana ships four
- * provisioned boards (overview, sessions, tools, alerts). Native npm scripts and
- * Docker Compose profiles are documented in `monitoring/README.md`.
- *
  * ## Public surface
  * - `TuiSegment` — exported API; see TSDoc on the symbol for behavior.
  * - `stripAnsi` — exported API; see TSDoc on the symbol for behavior.