docs(website): the spawn atlas API, the admin panel, and the delay-unit trap

Docs half of website #113 (Protocol 3.0 Part C, second website PR).

Carries the atlas rewrite that missed #67: that PR merged before the "derive
from the tree on every boot" commit was pushed, so `edge` currently describes
the build/import-artifact design that was rejected in review, not what shipped
in website #112. It lands here.

New in SPAWN_ATLAS.md: the six public routes and five admin ones, and three
behaviours that read as bugs unless they are written down — an unreadable tree
answers 200 with status "unavailable" rather than 500 (refresh reports outcomes
so boot is never blocked by a bad tree, and the contract is preserved at the
API), setting the ServUO path deliberately does not import, and `points` is a
count while `spawners` is the list.

Also the delay-unit trap: XmlSpawner stores MinDelay/MaxDelay in minutes OR
seconds per record, decided by that record's own DelayInSec flag, so a `5` is
five minutes on one spawner and five seconds on the next. Both are plausible
respawn times, which is what makes it silent. 170 of 6,455 stock spawners are
second-flagged. And PARSER_VERSION, which exists because hashing the tree alone
would strand an install whose maps never change on whatever an older parser
derived.

BACKEND_DESIGN.md gains the routes, the router-map entry, and the parser-version
rule. v3.md marks Part C done and records in 6.3 what the API half found.

api-route-inventory.json refreshed from the live manifest — it had drifted to
200 routes before this PR (real count was 204) and is now 215.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01U7CBg11prhLimL9iHSX1bP

website/api-route-inventory.json

@@ -257,6 +257,26 @@
       "method": "GET",
       "path": "/api/v1/admin/shard/accounts"
     },
+    {
+      "method": "GET",
+      "path": "/api/v1/admin/shard/atlas"
+    },
+    {
+      "method": "POST",
+      "path": "/api/v1/admin/shard/atlas/approve"
+    },
+    {
+      "method": "POST",
+      "path": "/api/v1/admin/shard/atlas/import"
+    },
+    {
+      "method": "PUT",
+      "path": "/api/v1/admin/shard/atlas/path"
+    },
+    {
+      "method": "POST",
+      "path": "/api/v1/admin/shard/atlas/reject"
+    },
     {
       "method": "GET",
       "path": "/api/v1/admin/shard/audit"
@@ -313,6 +333,14 @@
       "method": "GET",
       "path": "/api/v1/admin/shard/vendors/:account"
     },
+    {
+      "method": "GET",
+      "path": "/api/v1/admin/shard/visibility"
+    },
+    {
+      "method": "PUT",
+      "path": "/api/v1/admin/shard/visibility"
+    },
     {
       "method": "PUT",
       "path": "/api/v1/admin/site-mode"
@@ -705,6 +733,30 @@
       "method": "GET",
       "path": "/api/v1/player/shard/vendors/:account"
     },
+    {
+      "method": "GET",
+      "path": "/api/v1/public/atlas/champions"
+    },
+    {
+      "method": "GET",
+      "path": "/api/v1/public/atlas/creatures"
+    },
+    {
+      "method": "GET",
+      "path": "/api/v1/public/atlas/creatures/:slug"
+    },
+    {
+      "method": "GET",
+      "path": "/api/v1/public/atlas/landmarks"
+    },
+    {
+      "method": "GET",
+      "path": "/api/v1/public/atlas/meta"
+    },
+    {
+      "method": "GET",
+      "path": "/api/v1/public/atlas/regions"
+    },
     {
       "method": "POST",
       "path": "/api/v1/public/contact"
@@ -737,6 +789,10 @@
       "method": "GET",
       "path": "/api/v1/public/shard/economy"
     },
+    {
+      "method": "GET",
+      "path": "/api/v1/public/shard/features"
+    },
     {
       "method": "GET",
       "path": "/api/v1/public/shard/feed"
@@ -769,6 +825,10 @@
       "method": "GET",
       "path": "/api/v1/public/shard/presence"
     },
+    {
+      "method": "GET",
+      "path": "/api/v1/public/shard/ruleset"
+    },
     {
       "method": "GET",
       "path": "/api/v1/public/shard/status"