Docs: Add "Last Updated" timestamps to AGENTS.md and CODEMAP.md files

Signed-off-by: Michael Mayer <michael@photoprism.app>

AGENTS.md

@@ -1,5 +1,7 @@
 # PhotoPrism® Repository Guidelines
 
+**Last Updated:** September 25, 2025
+
 ## Purpose
 
 This file tells automated coding agents (and humans) where to find the single sources of truth for building, testing, and contributing to PhotoPrism.
@@ -261,6 +263,7 @@ If anything in this file conflicts with the `Makefile` or the Developer Guide, t
 - Respect precedence: `options.yml` overrides CLI/env values, which override defaults. When adding a new option, update `internal/config/options.go` (yaml/flag tags), register it in `internal/config/flags.go`, expose a getter, surface it in `*config.Report()`, and write generated values back to `options.yml` by setting `c.options.OptionsYaml` before persisting. Use `CliTestContext` in `internal/config/test.go` to exercise new flags.
 - When touching configuration in Go code, use the public accessors on `*config.Config` (e.g. `Config.JWKSUrl()`, `Config.SetJWKSUrl()`, `Config.ClusterUUID()`) instead of mutating `Config.Options()` directly; reserve raw option tweaks for test fixtures only.
 - Logging: use the shared logger (`event.Log`) via the package-level `log` variable (see `internal/auth/jwt/logger.go`) instead of direct `fmt.Print*` or ad-hoc loggers.
+- Cluster registry tests (`internal/service/cluster/registry`) currently rely on a full test config because they persist `entity.Client` rows. They run migrations and seed the SQLite DB, so they are intentionally slow. If you refactor them, consider sharing a single `config.TestConfig()` across subtests or building a lightweight schema harness; do not swap to the minimal config helper unless the tests stop touching the database.
 - Favor explicit CLI flags: check `c.cliCtx.IsSet("<flag>")` before overriding user-supplied values, and follow the `ClusterUUID` pattern (`options.yml` → CLI/env → generated UUIDv4 persisted).
 - Database helpers: reuse `conf.Db()` / `conf.Database*()`, avoid GORM `WithContext`, quote MySQL identifiers, and reject unsupported drivers early.
 - Handler conventions: reuse limiter stacks (`limiter.Auth`, `limiter.Login`) and `limiter.AbortJSON` for 429s, lean on `api.ClientIP`, `header.BearerToken`, and `Abort*` helpers, compare secrets with constant time checks, set `Cache-Control: no-store` on sensitive responses, and register routes in `internal/server/routes.go`. For new list endpoints default `count=100` (max 1000) and `offset≥0`, document parameters explicitly, and set portal mode via `PHOTOPRISM_NODE_ROLE=portal` plus `PHOTOPRISM_JOIN_TOKEN` when needed.

CODEMAP.md

@@ -1,5 +1,7 @@
 PhotoPrism — Backend CODEMAP
 
+**Last Updated:** September 24, 2025
+
 Purpose
 - Give agents and contributors a fast, reliable map of where things live and how they fit together, so you can add features, fix bugs, and write tests without spelunking.
 - Sources of truth: prefer Makefile targets and the Developer Guide linked in AGENTS.md.