docs(auth,users,devices,progress,matching): Beam batch 8 — WO5 backfill complete

14 endpoints backfilled: devices pending/approve/reject; users
password/profile/profile-delete self-service (admin variants in prose);
admin list_users + update_user_max_devices; progress history; book
matching; new password-rules doc.

Gate fix: authLabel missed JWT middleware written inline as
createJWTMiddleware(cfg) (uppercase 'JWT') — reported auth 'none' for
/api/auth self-service routes and would have for any wrapper-inlined
group. Labeled 'JWTMiddleware' + fallthrough 'jwt' case.

Claude registry: 12 entries. Drift fixed by gate: list_users on-device —
handler returns raw []database.Users (bare array, full model incl.
password_hash — real leak the API emits; pinned + documented; earlier
draft had invented {users,total,limit,offset} wrapper). max-devices
response is {message} only. books/match is GET /api/books/match
{matches, action}. progress history sessions = ReadingHistory rows
(pgtype fields). make test 9/9.

docs/developer/api/authentication/password_rules.md

@@ -0,0 +1,31 @@
+---
+method: GET
+path: /api/auth/password-rules
+auth: none
+area: authentication
+---
+<!-- source: internal/handlers/auth.go:746 AuthHandler.GetPasswordRules -->
+
+# Password Rules
+
+Returns the active password complexity configuration, so UI requirement
+checkers mirror the real rules. The server remains the enforcer. This
+route is rate-limited.
+
+## Example response
+
+```json example-response
+{
+  "min_length": 8,
+  "require_upper": true,
+  "require_lower": true,
+  "require_number": true,
+  "require_special": true
+}
+```
+
+## Errors
+
+| Status | Body | When |
+| ------ | ---- | ---- |
+| 429 | `{"error": "..."}` | rate limited |