feat(rust): NPC sides, the faction table, an event's escort, ally and tether (runicnpc stage 5)

RunicNPC stage 5 on the site (docs runicnpc/PLAN.md, D253-D272):

- profiles gain the guard role, faction, relations (its own exceptions),
  alertRadius, turrets, hurtByPlayers, hurtsPlayers and kitUse, checked in
  RunicNPC's order and words, and defaulting to "players only" (D255);
- the faction table: one site-wide table, one row per pair and both ways
  (D254, D268), stored in rust_npc_factions, edited on the NPC profiles page
  (PUT /admin/rust/npcs/factions), pushed to every server with its
  profiles and hashed with them, and a standalone server's own pairs
  adopted at its first push with the site's winning (D244, D251);
- the Place NPCs step takes escort (a Steam id or a {placeholder}), an ally
  (a clan from the new rust.options.clans source, or the team of a player)
  and tether (the zone this event made), for a RunicNPC profile only
  (D269, D270, D272);
- a placement may be held inside a zone (tether, D272);
- the bridge's RunicNPC API floor is 4.

Tests: 488 server, 66 client. routes.manifest.json regenerated against the
pinned core (one route added).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

server/db/schema.sql

@@ -1305,7 +1305,7 @@ CREATE TABLE IF NOT EXISTS rust_npc_profile_servers (
 -- server's own profiles were read and imported (D244); until then nothing is
 -- pushed there. `pushed` is the name → site profile id map of the last push,
 -- which is how a kill is credited to "this profile only" (D247). `state` is
--- `ok`, `failed`, or `absent` (no RunicNPC, or one older than API 3).
+-- `ok`, `failed`, or `absent` (no RunicNPC, or one older than API 4).
 CREATE TABLE IF NOT EXISTS rust_npc_sync (
   server_id        VARCHAR(64)   NOT NULL PRIMARY KEY,
   adopted_at       DATETIME      NULL,
@@ -1338,6 +1338,17 @@ CREATE TABLE IF NOT EXISTS rust_npc_kills (
   KEY idx_rust_npc_kills_site (site_profile_id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
+-- The faction table (runicnpc stage 5, D254, D268): how factions treat each
+-- other, one row per pair and both ways, stored with `a` before `b`. One table
+-- for the whole site, pushed to every server with its profiles. `scientists`
+-- and `animals` are Rust's own two; a pair that is not here is neutral.
+CREATE TABLE IF NOT EXISTS rust_npc_factions (
+  a         VARCHAR(40)  NOT NULL,
+  b         VARCHAR(40)  NOT NULL,
+  relation  VARCHAR(8)   NOT NULL,
+  PRIMARY KEY (a, b)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
 -- A title rule on a profile's kills names the site profile it ranks (runicnpc
 -- stage 4, D250). Null for every other stat. No foreign key: a deleted profile
 -- leaves a rule that ranks nobody, which the form shows and an admin removes.