refactor(server): extract the wishlist routes into routers/wanted.py (R3)

Free after _clean_str moved to lib (#841): wanted's deps are JSONResponse,
_clean_str (reqfields), app + meta_db (seam). 3 routes (list/add/remove),
0 setattr targets, 0 helpers to relocate.

Bodies verbatim; @app -> @router, meta_db -> appstate.meta_db. include_router at
the original site; 143-route table identical. No test retargeting.

server.py: 8,003 -> 7,974 (this branch is independent of the chart PR).

Verified: pyflakes clean; route table identical; pytest 2401 passed (52 in
test_wanted_api); eslint 0. Boot smoke: add wishlist entry -> list -> delete,
400 on missing artist+title (_clean_str path).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/size-exemptions.md

@@ -55,8 +55,8 @@ without a *signed* exemption" is unenforceable.
 ## Planned, NOT exempt (owned by split plans — listed so nothing falls between states)
 
 core `static/app.js` (11,852) · `static/highway.js` (4,168, whole file) · `server.py`
-(7,909 — was 14,037; ratcheted by the R3 `MetadataDB` + `AudioEffectsMappingDB`
-extractions and six `routers/` modules) ·
+(7,880 — was 14,037; ratcheted by the R3 `MetadataDB` + `AudioEffectsMappingDB`
+extractions and seven `routers/` modules) ·
 `lib/metadata_db.py` (4,373 — new in R3; the `MetadataDB` class alone is 4,018 lines
 and is a monolith in its own right, to be split per-table once the router train
 lands) · `static/v3/songs.js` (4,134) · `static/capabilities/audio-session.js`

lib/routers/wanted.py

@@ -0,0 +1,45 @@
+"""Wishlist / "wanted" API (feedBack#636) — songs the user wants but doesn't own.
+
+Extracted verbatim from ``server.py`` (R3); edits: ``@app`` -> ``@router``,
+``meta_db`` -> ``appstate.meta_db``, ``_clean_str`` from ``reqfields``.
+"""
+
+from fastapi import APIRouter
+from fastapi.responses import JSONResponse
+
+import appstate
+from reqfields import _clean_str
+
+router = APIRouter()
+
+
+@router.get("/api/wanted")
+def api_list_wanted():
+    """The wishlist — songs the user wants but doesn't own yet (newest first)."""
+    return {"wanted": appstate.meta_db.list_wanted()}
+
+
+@router.post("/api/wanted")
+def api_add_wanted(data: dict):
+    """Add a not-owned song to the wishlist. `artist`/`title` are required (at
+    least one non-empty); `source`/`source_ref`/`note` are optional. Idempotent
+    on identity so producers (find_more ownership-diff, manual add) can re-post."""
+    if not isinstance(data, dict):
+        return JSONResponse({"error": "body must be an object"}, status_code=400)
+    artist = _clean_str(data.get("artist"))
+    title = _clean_str(data.get("title"))
+    if not artist and not title:
+        return JSONResponse({"error": "artist or title required"}, status_code=400)
+    row = appstate.meta_db.add_wanted(
+        artist=artist, title=title,
+        source=_clean_str(data.get("source")) or "manual",
+        source_ref=_clean_str(data.get("source_ref")),
+        note=_clean_str(data.get("note")),
+    )
+    return {"ok": True, "wanted": row}
+
+
+@router.delete("/api/wanted/{wanted_id}")
+def api_remove_wanted(wanted_id: int):
+    """Remove a wishlist entry by id."""
+    return {"ok": appstate.meta_db.remove_wanted(wanted_id)}

server.py

@@ -55,7 +55,7 @@ from dlc_paths import _get_dlc_dir, _resolve_dlc_path
 # Lives in lib/ because that is the one core dir every packaging path copies.
 import appstate
 # Extracted route modules. They import `appstate`, never `server` — one-way graph.
-from routers import audio_effects, artist_aliases, loops, playlists, ws_highway, chart
+from routers import audio_effects, artist_aliases, loops, playlists, ws_highway, chart, wanted
 import sloppak as sloppak_mod
 import loosefolder as loosefolder_mod
 # Pure text-matching engine for MusicBrainz enrichment (P8): denoise/score/
@@ -5375,37 +5375,8 @@ def api_session_continue():
 
 
 # ── Wishlist / "wanted" API (feedBack#636 item 4) ─────────────────────────────
-
-@app.get("/api/wanted")
-def api_list_wanted():
-    """The wishlist — songs the user wants but doesn't own yet (newest first)."""
-    return {"wanted": meta_db.list_wanted()}
-
-
-@app.post("/api/wanted")
-def api_add_wanted(data: dict):
-    """Add a not-owned song to the wishlist. `artist`/`title` are required (at
-    least one non-empty); `source`/`source_ref`/`note` are optional. Idempotent
-    on identity so producers (find_more ownership-diff, manual add) can re-post."""
-    if not isinstance(data, dict):
-        return JSONResponse({"error": "body must be an object"}, status_code=400)
-    artist = _clean_str(data.get("artist"))
-    title = _clean_str(data.get("title"))
-    if not artist and not title:
-        return JSONResponse({"error": "artist or title required"}, status_code=400)
-    row = meta_db.add_wanted(
-        artist=artist, title=title,
-        source=_clean_str(data.get("source")) or "manual",
-        source_ref=_clean_str(data.get("source_ref")),
-        note=_clean_str(data.get("note")),
-    )
-    return {"ok": True, "wanted": row}
-
-
-@app.delete("/api/wanted/{wanted_id}")
-def api_remove_wanted(wanted_id: int):
-    """Remove a wishlist entry by id."""
-    return {"ok": meta_db.remove_wanted(wanted_id)}
+# Mounted here (registration order). Implementation in lib/routers/wanted.py.
+app.include_router(wanted.router)
 
 
 # ── Loops API ────────────────────────────────────────────────────────────────