feat(registry): AssetResolver + diffuser supplier curves (Jäger / Aerostrip / PIK / PRK)

Two related changes bundled together because the diffuser curve files
only make sense once the registry namespace they live in exists.

src/registry — new asset-metadata resolver:
- AssetResolver with synchronous resolve(namespace, id) + lazy cache,
  async refresh() for future remote pulls.
- FileBackend (per-id or single-file layouts, case-insensitive) and a
  stub HttpBackend (disabled unless EVOLV_ASSET_REMOTE=1).
- Namespaces: curves, menu, monsterSamples, monsterSpecs, units. Menu
  namespace re-keys by inner softwareType + filename so editors that
  pass either string resolve to the same tree.
- README explains how to add a namespace.
- AssetCategoryManager (datasets/assetData/index.js) becomes a thin
  facade over the resolver so existing consumers don't move.
- 246/246 tests pass — including the 39-test registry suite.

datasets/assetData — file moves + new diffuser data:
- modelData/*.json deleted; curves/*.json is the canonical home.
- New diffuser.json menu tree with GVA, Jäger, Aquaconsult/Entec,
  PIK/PRK suppliers.
- gva-elastox-r.json migrated from the inline _loadSpecs hardcode,
  re-tagged coverageBasis="bottom-coverage-pct" (the legacy 2.4
  elements/m² was a prior mis-conversion; we can't recover the
  original % so it's a single-point curve under key "0").
- jaeger-jetflex-td-65-2-g-epdm-1000.json — extracted from the Jäger
  EPDM-1000mm SSOTE/DWP chart on the data sheet (vector-PDF read).
  SSOTE 8.20→6.40 %/m, DWP 25→48 mbar across Q 2-12 Nm³/h. Single
  coverage (vendor doesn't state test conditions).
- aerostrip-phoenix.json — 4-coverage SOTE family at 4.75 m water
  depth (DD 5/10/15/20 %, flux 10-70 Nm³/h·m²) from the Entec/de
  Winter 2023-11-22 dataset; DWP curve from the 21 % @ 4.05 m chart.
- pik300.json / prk300.json — 5-coverage SOTE + SSOTR (DD 5-25 %)
  with split DWP per model variant, water depth ≈ 4.0 m inferred from
  the SOTE↔SSOTR ratio in the source spreadsheet.

src/configs/diffuser.json:
- New asset.{model, assetTagNumber} block so the editor's selected
  model id survives validation.
- diffuser.density description corrected to "Bottom coverage [%]";
  default 2.4 → 15 (typical fine-bubble install).

src/configs/{rotatingMachine,valve}.json: small alignment edits that
came with the registry phase.

src/menu/asset.js + src/menu/aquonSamples.js: rewritten as facades
over assetResolver, keeping the editor-side cascade behaviour intact.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

datasets/assetData/curves/aerostrip-phoenix.json

@@ -0,0 +1,44 @@
+{
+    "_meta": {
+        "supplier": "Aquaconsult Anlagenbau / Entec",
+        "type": "Strip",
+        "model": "AEROSTRIP",
+        "membrane": "PHOENIX",
+        "stdAir": { "temp_C": 0, "pressure_mbar": 1013.25, "RH_pct": 0 },
+        "coverageBasis": "bottom-coverage-pct",
+        "coverageReference": [5, 10, 15, 20],
+        "dataQuality": "multi-coverage",
+        "xAxisBasis": "per-m2-membrane-Nm3h",
+        "yAxisBasis": "ssotr-g-per-Nm3-per-m",
+        "waterDepth_m": 4.75,
+        "sources": [
+            "Floris de Winter (Entec Holland) email to R. de Ren on 2023-11-22 — tabulated SOTE [%] at 4.75 m water depth for bottom coverage 5/10/15/20 % at fluxes 10/25/40/55/70 Nm3/(h*m2 membrane). Original chart in 'SSOTE_4.75m different density.pdf'.",
+            "'SSOTR_dP.pdf' — AEROSTRIP fine-bubble diffuser SSOTR + Druckverlust (DWP) chart at water depth 4.05 m, blow-in depth 4.00 m, 21 % bottom coverage. Used for the DWP curve only (read off the vector chart)."
+        ],
+        "note": "X-axis is flux per m² of membrane area, NOT per element. The existing diffuser specificClass passes `flow_per_element` to the interpolator — if you wire an AEROSTRIP model in, you must either set elements/area such that flow_per_element == flux_per_m2_membrane, OR extend _calcOtrPressure to apply the membrane-area conversion. SSOTR values are SOTE [%] / water_depth_m * 0.299 kg-O2/Nm3 * 10 (linear depth scaling). DWP curve was measured at 21 % bottom coverage; pressure loss is intrinsic to the diffuser geometry so the curve is shared across coverage values."
+    },
+    "sote_curve": {
+        "5":  { "x": [10, 25, 40, 55, 70], "y": [34.20, 28.75, 26.16, 24.89, 24.19] },
+        "10": { "x": [10, 25, 40, 55, 70], "y": [42.01, 35.32, 32.14, 30.58, 29.71] },
+        "15": { "x": [10, 25, 40, 55, 70], "y": [43.39, 36.48, 33.20, 31.59, 30.69] },
+        "20": { "x": [10, 25, 40, 55, 70], "y": [43.80, 36.82, 33.51, 31.88, 30.97] }
+    },
+    "ssote_curve": {
+        "5":  { "x": [10, 25, 40, 55, 70], "y": [7.20, 6.05, 5.51, 5.24, 5.09] },
+        "10": { "x": [10, 25, 40, 55, 70], "y": [8.84, 7.44, 6.77, 6.44, 6.26] },
+        "15": { "x": [10, 25, 40, 55, 70], "y": [9.14, 7.68, 6.99, 6.65, 6.46] },
+        "20": { "x": [10, 25, 40, 55, 70], "y": [9.22, 7.75, 7.06, 6.71, 6.52] }
+    },
+    "otr_curve": {
+        "5":  { "x": [10, 25, 40, 55, 70], "y": [21.53, 18.10, 16.47, 15.67, 15.23] },
+        "10": { "x": [10, 25, 40, 55, 70], "y": [26.44, 22.23, 20.23, 19.25, 18.70] },
+        "15": { "x": [10, 25, 40, 55, 70], "y": [27.31, 22.96, 20.90, 19.89, 19.32] },
+        "20": { "x": [10, 25, 40, 55, 70], "y": [27.57, 23.18, 21.10, 20.06, 19.49] }
+    },
+    "p_curve": {
+        "21": {
+            "x": [5, 10, 25, 40, 55, 70, 80],
+            "y": [46.0, 47.3, 51.1, 54.9, 58.7, 62.4, 65.0]
+        }
+    }
+}