feat: implement new storage design per issue #2

- Storage: Change from per-user to per-group JSON files
- Data location: ~/.jigaido/ instead of apps/telegram-bot/data/
- Group bounties: data/{group_id}/group.json
- User tracking: data/{group_id}/{user_id}.json
- Personal bounties: data/{user_id}/user.json
- Update commands.py for new storage model
- Update bot.py to remove admin handlers
- Update tests to reflect created_by_user_id field
- Update SPEC.md with new design

Addresses user feedback from issue #2

apps/telegram-bot/tests/test_commands.py

@@ -101,12 +101,21 @@ class TestParseArgs:
 
 
 class TestFormatBounty:
-    def _row(self, id=1, text="Test bounty", link="https://example.com",
-             due_date_ts=None, informed_by_username="alice"):
+    def _row(
+        self,
+        id=1,
+        text="Test bounty",
+        link="https://example.com",
+        due_date_ts=None,
+        created_by_user_id=123456,
+    ):
         row = MagicMock()
         row.__getitem__ = lambda s, k: {
-            "id": id, "text": text, "link": link,
-            "due_date_ts": due_date_ts, "informed_by_username": informed_by_username
+            "id": id,
+            "text": text,
+            "link": link,
+            "due_date_ts": due_date_ts,
+            "created_by_user_id": created_by_user_id,
         }[k]
         return row
 
@@ -155,12 +164,7 @@ class TestFormatBounty:
         out = format_bounty(b)
         assert "OVERDUE" in out
 
-    def test_informed_by_shown(self):
-        b = self._row(informed_by_username="bob")
+    def test_created_by_shown(self):
+        b = self._row(created_by_user_id=999)
         out = format_bounty(b)
-        assert "@bob" in out
-
-    def test_informed_by_unknown_fallback(self):
-        b = self._row(informed_by_username=None)
-        out = format_bounty(b)
-        assert "@unknown" in out
+        assert "999" in out