refactor: implement full projects CRUD, move icons onto tag schema

- Remove priority field and sorting, switch to updated_at DESC
- Add icon field to tags table
- Split project description into name and short_description
- Implement full CRUD for projects (create, update, delete)
- Add admin stats endpoint (project counts by status)

.sqlx/query-7221aa294be3a27520a25739ebf5d4d8a57ac35b7b04be94027a33b4bf845195.json

@@ -0,0 +1,56 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "\n        UPDATE tags\n        SET slug = $2, name = $3, icon = $4, color = $5\n        WHERE id = $1\n        RETURNING id, slug, name, icon, color, created_at\n        ",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "id",
+        "type_info": "Uuid"
+      },
+      {
+        "ordinal": 1,
+        "name": "slug",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 2,
+        "name": "name",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 3,
+        "name": "icon",
+        "type_info": "Text"
+      },
+      {
+        "ordinal": 4,
+        "name": "color",
+        "type_info": "Varchar"
+      },
+      {
+        "ordinal": 5,
+        "name": "created_at",
+        "type_info": "Timestamptz"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Uuid",
+        "Text",
+        "Text",
+        "Text",
+        "Varchar"
+      ]
+    },
+    "nullable": [
+      false,
+      false,
+      false,
+      true,
+      true,
+      false
+    ]
+  },
+  "hash": "7221aa294be3a27520a25739ebf5d4d8a57ac35b7b04be94027a33b4bf845195"
+}