docs: add block/mute user relations, emoji-sync CLI, and uid indexes

- Add `/block`, `/mute` endpoints with block/unblock and mute/unmute functionality in `routers/relations.py`, hiding blocked users' content everywhere except their own profile while muting only suppresses notifications
- Introduce `devplace emoji-sync` CLI command to regenerate `static/js/emoji-shortcodes.js` from the emoji library, documented in `CLAUDE.md` and wired in `cli.py`
- Create `get_blocked_uids()` database helper and apply it in `content.py` `load_detail()` to filter blocked users' posts from detail views
- Implement `_uid_index()` and `_drop_index()` helpers in `database.py` for unique uid indexes across tables, with `user_relations` added to `SOFT_DELETE_TABLES`
- Document new routes in `AGENTS.md` and `README.md`, including emoji shortcodes rendering behavior distinct from the emoji picker

devplacepy/services/bot/bot.py

@@ -264,6 +264,7 @@ class DevPlaceBot:
                     or []
                 )
             self.state.username = self._next_handle()
+            self.state.account_api_key = ""
             self.state.email = self.faker.email()
             self.state.password = self.faker.password(length=random.randint(12, 18))
             self.state.started_at = datetime.now().isoformat()
@@ -312,6 +313,7 @@ class DevPlaceBot:
                 self.state.username = f"{base}{random.randint(10, 9999)}"[:20]
             else:
                 self.state.username = self._next_handle()
+            self.state.account_api_key = ""
             self.state.email = self.faker.email()
             self._log(f"Signup failed, retrying as {self.state.username}")
         return False
@@ -337,16 +339,14 @@ class DevPlaceBot:
         return (key or "").strip()
 
     async def _adopt_account_api_key(self) -> bool:
-        if self.state.account_api_key:
-            self.llm.api_key = self.state.account_api_key
-            return True
         for attempt in range(5):
             key = await self._fetch_account_api_key()
             if key:
-                self.state.account_api_key = key
+                if key != self.state.account_api_key:
+                    self.state.account_api_key = key
+                    self._save()
+                    self._log("Adopted account API key for gateway calls")
                 self.llm.api_key = key
-                self._save()
-                self._log("Adopted account API key for gateway calls")
                 return True
             if attempt < 4:
                 await asyncio.sleep(2)