chore(modules): bump MODULE_API_VERSION to 1.4.0 — the sidecar rule

Phase 5 decision 4 (MODULE_SYSTEM.md §2.11.1): a module does not open a
connection to a game server from the website process. It talks to a sidecar,
which owns the durable copy of the game's state.

No member was added, removed or changed — the surface is identical to 1.3.0.
Minor rather than major because module-uo's `coreApi: "^1.3.0"` still resolves
and module-uo already complies, but a module written against 1.3.0 could
satisfy every member and still be built the wrong way round, which is what this
number now says.

The rule itself is MODULE_API.md §2.7 (docs, separate PR) and is the one
prohibition there with no CI behind it: an outbound socket is not statically
detectable the way an internal require is (§5.1).

742 server + 187 client tests pass; routes.manifest.json and swagger-output.json
regenerate byte-identical.

Co-Authored-By: Claude <noreply@anthropic.com>

server/src/modules/version.js

@@ -9,6 +9,15 @@
 // Deliberately separate from PROTOCOL_VERSION (which versions the shard wire and
 // has nothing to say about a website module) and from any module's own version.
 
+// 1.4.0 — no member changed. §2.7 gained one prohibition: a module does not open
+// a connection to a game server from the website process; it talks to a sidecar,
+// which owns the durable copy of the game's state. Minor rather than major
+// because the SURFACE is identical to 1.3.0 — module-uo's `coreApi: "^1.3.0"`
+// still resolves, and it already complies — but a module written against 1.3.0
+// could satisfy every member and still be built the wrong way round, which is
+// what this number now says. The one §2.7 rule with no CI behind it: an outbound
+// socket is not statically detectable the way an internal require is.
+//
 // 1.3.0 — three CLIENT additions from Phase 3 slice 3: a nav item may carry an
 // `icon`, core declares a `player.invite.accepted` slot, and `window.__rg.api`
 // gained `BASE` (which §3.5 always specified and shared.js never published).
@@ -26,6 +35,6 @@
 // an admin action a module performs belongs in core's one audit log, the
 // extension slot needs the user its prefix names, and §2.7 forbids a module
 // reading core's `APP_BASE_URL` for itself. Additions only, so minor.
-const MODULE_API_VERSION = '1.3.0'
+const MODULE_API_VERSION = '1.4.0'
 
 module.exports = { MODULE_API_VERSION }