feat: add connection API endpoints

Suggestions, create/confirm/hide/withdraw actions, my connections list,
and pending count for nav badge.

server/api/connections/index.get.js

@@ -0,0 +1,45 @@
+import Connection from '../../models/connection.js'
+import { requireAuth } from '../../utils/auth.js'
+
+export default defineEventHandler(async (event) => {
+  const member = await requireAuth(event)
+  const memberId = member._id
+
+  const [confirmed, pendingOutgoing, pendingIncoming] = await Promise.all([
+    Connection.find({
+      status: 'confirmed',
+      hiddenBy: { $ne: memberId },
+      $or: [
+        { initiator: memberId },
+        { recipient: memberId }
+      ]
+    })
+      .populate('initiator recipient', 'name avatar craftTags circle')
+      .sort({ confirmedAt: -1 })
+      .lean(),
+
+    Connection.find({
+      initiator: memberId,
+      status: 'pending',
+      hiddenBy: { $ne: memberId }
+    })
+      .populate('recipient', 'name avatar craftTags circle')
+      .sort({ createdAt: -1 })
+      .lean(),
+
+    Connection.find({
+      recipient: memberId,
+      status: 'pending',
+      hiddenBy: { $ne: memberId }
+    })
+      .populate('initiator', 'name avatar craftTags circle')
+      .sort({ createdAt: -1 })
+      .lean()
+  ])
+
+  return {
+    confirmed,
+    pendingOutgoing,
+    pendingIncoming
+  }
+})