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

tests/api/dbapi/conftest.py

@@ -5,7 +5,7 @@ from datetime import datetime, timezone
 import pytest
 from fastapi.testclient import TestClient
 
-from devplacepy.database import get_table, internal_gateway_key, purge, refresh_snapshot
+from devplacepy.database import get_table, purge, refresh_snapshot
 from devplacepy.main import app
 from devplacepy.services.manager import service_manager
 from devplacepy.utils import generate_uid
@@ -55,4 +55,32 @@ def client():
 
 @pytest.fixture
 def auth(client):
-    return {"X-API-KEY": internal_gateway_key()}
+    from devplacepy.database import get_primary_admin_uid, invalidate_admins_cache
+    from devplacepy.utils import clear_user_cache
+
+    users = get_table("users")
+    uid = get_primary_admin_uid()
+    if uid is None:
+        uid = generate_uid()
+        users.insert(
+            {
+                "uid": uid,
+                "username": f"dbapi_admin_{uid[:8]}",
+                "email": f"{uid[:8]}@dbapi.test",
+                "role": "Admin",
+                "api_key": f"dbapikey_{uid}",
+                "xp": 0,
+                "level": 1,
+                "created_at": datetime.now(timezone.utc).isoformat(),
+            }
+        )
+        invalidate_admins_cache()
+        refresh_snapshot()
+    admin = users.find_one(uid=uid)
+    key = admin.get("api_key")
+    if not key:
+        key = f"dbapikey_{uid}"
+        users.update({"uid": uid, "api_key": key}, ["uid"])
+        clear_user_cache(uid)
+        refresh_snapshot()
+    return {"X-API-KEY": key}