feat: global search and keyboard shortcuts

Ctrl/⌘ K (or /) opens a search over the projects and tickets of all my
projects, driven by the keyboard. g plus a letter moves between project
pages, c creates a ticket on the board, e edits the open ticket and ?
lists every shortcut. My work can now be searched by text through the API.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/api/openapi.json

@@ -2041,6 +2041,15 @@
                 "$ref": "#/components/schemas/StatusCategory"
               }
             }
+          },
+          {
+            "name": "search",
+            "required": false,
+            "in": "query",
+            "description": "Matches key, title or description",
+            "schema": {
+              "type": "string"
+            }
           }
         ],
         "responses": {