feat(server): print startup banner before heavy imports load

[lstein]

Problem

Running start_photomap leaves the terminal silent for ~10-30s (platform-dependent) before any status message appears. The console script maps to photomap.backend.photomap_server:main, so Python must import that module — which pulls in FastAPI, the routers, and transitively CLIP/torch — before a single line of main() runs. Any banner printed inside main() is therefore too late.

Fix

Add a lightweight photomap/backend/launch.py shim that imports nothing heavy at module scope. It prints PhotoMapAI server initializing… immediately, then defers the expensive from photomap.backend.photomap_server import main until inside its own main(). Repoint the start_photomap console script at photomap.backend.launch:main.

Relaunch loop / inline-update safety

The supervisor relaunch loop and the inline-update restart are unaffected: they respawn workers via python -m photomap.backend.photomap_server … --once, which never goes through launch.py. The banner prints once in the parent; each respawn still logs Loading... via the existing supervisor loop.

Verification

• Banner appears within ~1s, before the heavy import completes.
• End-to-end: supervisor spawns a worker (HTTP 200) → SIGTERM the worker to simulate an inline-update restart → supervisor respawns a fresh worker (HTTP 200 again).
• ruff check passes on the new module.

Note

Changing the entry-point target regenerates the start_photomap console script, so existing checkouts need a pip install -e . to pick it up.

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