feat: add Koa2 BFF server, CLI management, sessions CLI integration, and logs page

- Add Koa2 BFF layer for API proxy, file upload, session management
- Auto-check and enable api_server in ~/.hermes/config.yaml on startup
- Integrate sessions with Hermes CLI (list, get, delete)
- Add Logs page with level filtering, log file selection, and search
- Add CLI commands: start/stop/restart/status for daemon management
- Unify package.json for frontend and server dependencies
- Default port changed to 8648

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/api/logs.ts

@@ -0,0 +1,36 @@
+import { request } from './client'
+
+export interface LogFileInfo {
+  name: string
+  size: string
+  modified: string
+}
+
+export interface LogEntry {
+  timestamp: string
+  level: string
+  logger: string
+  message: string
+  raw: string
+}
+
+export async function fetchLogFiles(): Promise<LogFileInfo[]> {
+  const res = await request<{ files: LogFileInfo[] }>('/api/logs')
+  return res.files
+}
+
+export async function fetchLogs(name: string, params?: {
+  lines?: number
+  level?: string
+  session?: string
+  since?: string
+}): Promise<LogEntry[]> {
+  const query = new URLSearchParams()
+  if (params?.lines) query.set('lines', String(params.lines))
+  if (params?.level) query.set('level', params.level)
+  if (params?.session) query.set('session', params.session)
+  if (params?.since) query.set('since', params.since)
+  const qs = query.toString()
+  const res = await request<{ entries: (LogEntry | null)[] }>(`/api/logs/${name}${qs ? `?${qs}` : ''}`)
+  return res.entries.filter((e): e is LogEntry => e !== null)
+}

src/api/sessions.ts

@@ -0,0 +1,61 @@
+import { request } from './client'
+
+export interface SessionSummary {
+  id: string
+  source: string
+  model: string
+  title: string | null
+  started_at: number
+  ended_at: number | null
+  message_count: number
+  tool_call_count: number
+  input_tokens: number
+  output_tokens: number
+  billing_provider: string | null
+  estimated_cost_usd: number
+}
+
+export interface SessionDetail extends SessionSummary {
+  messages: HermesMessage[]
+}
+
+export interface HermesMessage {
+  id: number
+  session_id: string
+  role: 'user' | 'assistant' | 'system' | 'tool'
+  content: string
+  tool_call_id: string | null
+  tool_calls: any[] | null
+  tool_name: string | null
+  timestamp: number
+  token_count: number | null
+  finish_reason: string | null
+  reasoning: string | null
+}
+
+export async function fetchSessions(source?: string, limit?: number): Promise<SessionSummary[]> {
+  const params = new URLSearchParams()
+  if (source) params.set('source', source)
+  if (limit) params.set('limit', String(limit))
+  const query = params.toString()
+  const res = await request<{ sessions: SessionSummary[] }>(`/api/sessions${query ? `?${query}` : ''}`)
+  return res.sessions
+}
+
+export async function fetchSession(id: string): Promise<SessionDetail | null> {
+  try {
+    const res = await request<{ session: SessionDetail }>(`/api/sessions/${id}`)
+    return res.session
+  } catch {
+    return null
+  }
+}
+
+export async function deleteSession(id: string): Promise<boolean> {
+  try {
+    await request(`/api/sessions/${id}`, { method: 'DELETE' })
+    return true
+  } catch {
+    return false
+  }
+}