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>

server/src/routes/logs.ts

@@ -0,0 +1,61 @@
+import Router from '@koa/router'
+import * as hermesCli from '../services/hermes-cli'
+
+export const logRoutes = new Router()
+
+// List available log files
+logRoutes.get('/api/logs', async (ctx) => {
+  const files = await hermesCli.listLogFiles()
+  ctx.body = { files }
+})
+
+interface LogEntry {
+  timestamp: string
+  level: string
+  logger: string
+  message: string
+  raw: string
+}
+
+// Parse a single log line into structured entry
+function parseLine(line: string): LogEntry | null {
+  // Match: 2026-04-11 20:16:16,289 INFO aiohttp.access: message
+  const match = line.match(/^(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3})\s+(DEBUG|INFO|WARNING|ERROR|CRITICAL)\s+(\S+?):\s(.*)$/)
+  if (match) {
+    return {
+      timestamp: match[1],
+      level: match[2],
+      logger: match[3],
+      message: match[4],
+      raw: line,
+    }
+  }
+  // Unparseable line (e.g. traceback continuation)
+  return null
+}
+
+// Read log lines (parsed)
+logRoutes.get('/api/logs/:name', async (ctx) => {
+  const logName = ctx.params.name
+  const lines = ctx.query.lines ? parseInt(ctx.query.lines as string, 10) : 100
+  const level = (ctx.query.level as string) || undefined
+  const session = (ctx.query.session as string) || undefined
+  const since = (ctx.query.since as string) || undefined
+
+  try {
+    const content = await hermesCli.readLogs(logName, lines, level, session, since)
+    const rawLines = content.split('\n')
+
+    const entries: (LogEntry | null)[] = []
+    for (const line of rawLines) {
+      // Skip header lines like "--- ~/.hermes/logs/agent.log (last 100) ---"
+      if (line.startsWith('---') || line.trim() === '') continue
+      entries.push(parseLine(line))
+    }
+
+    ctx.body = { entries }
+  } catch (err: any) {
+    ctx.status = 500
+    ctx.body = { error: err.message }
+  }
+})