fix(docs): repair the escaped apostrophes, and document this module's env vars

Nineteen `#swagger` descriptions carried a `\'` inside a single-quoted string.
That is correct JavaScript and wrong here: swagger-autogen does not evaluate the
annotation as JS, so the backslash survives into the spec and Swagger UI renders
"the shard\'s published ruleset" to a reader. Replaced with a typographic
apostrophe, which the same files already use elsewhere.

Found by opening /api/docs in a browser against a real core with this module
installed — the fragment was valid JSON, the paths were right, every test passed,
and it was still wrong on screen. Nothing that reads the artifact can see this;
only reading the rendered page can.

Also documents the four environment variables this module reads
(UOLINK_BASE_URL / _WS_URL / _PROTOCOL, TOWNCRIER_DURATION_SEC). Core's
.env.example is dropping them in the paired website PR: they were never core's,
and a half-copy in two repos goes stale silently.

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

server/router/admin/shard.router.js

@@ -331,7 +331,7 @@ shardRouter.post(
   '/clilocs/import',
   // #swagger.tags = ['Admin · Shard']
   // #swagger.summary = 'Re-import the cliloc table from its source files (admin only)'
-  // #swagger.description = 'Applies a client patch, or a change to the shard\'s own overlay files, without a restart. `force` reimports even when the source hashes match what is loaded. `approve` accepts a refresh in which a previously-loaded source has VANISHED — refused by default, because an unmounted volume and a deliberate deletion are indistinguishable from the server, and the wrong guess silently drops every name that file contributed. A missing path — or the common mistake of pointing at the client\'s own COMPRESSED Cliloc.enu — answers 200 with status "unavailable" and the reason, rather than 500: the refresh contract reports outcomes instead of throwing, and the admin needs to be told which file to convert.'
+  // #swagger.description = 'Applies a client patch, or a change to the shard’s own overlay files, without a restart. `force` reimports even when the source hashes match what is loaded. `approve` accepts a refresh in which a previously-loaded source has VANISHED — refused by default, because an unmounted volume and a deliberate deletion are indistinguishable from the server, and the wrong guess silently drops every name that file contributed. A missing path — or the common mistake of pointing at the client’s own COMPRESSED Cliloc.enu — answers 200 with status "unavailable" and the reason, rather than 500: the refresh contract reports outcomes instead of throwing, and the admin needs to be told which file to convert.'
   // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
   /* #swagger.requestBody = { required: false, content: { "application/json": { schema: { type: "object", properties: { force: { type: "boolean", description: "Reimport even if the sources are unchanged." }, approve: { type: "boolean", description: "Accept a refresh in which a previously-loaded source has vanished." } } } } } } */
   /* #swagger.responses[200] = { description: 'What happened', content: { "application/json": { schema: { $ref: "#/components/schemas/UoClilocRefreshResult" } } } } */