Modularize Go files, extract JS to static, implement competitor pricelists

Go refactoring:
- Split handlers/pricing.go (2446→291 lines) into 5 focused files
- Split services/stock_import.go (1334→~400 lines) into stock_mappings.go + stock_parse.go
- Split services/sync/service.go (1290→~250 lines) into 3 files

JS extraction:
- Move all inline <script> blocks to web/static/js/ (6 files)
- Templates reduced: admin_pricing 2873→521, lot 1531→304, vendor_mappings 1063→169, etc.

Competitor pricelists (migrations 033-039):
- qt_competitors + partnumber_log_competitors tables
- Excel import with column mapping, dedup, bulk insert
- p/n→lot resolution via weighted_median, discount applied
- Unmapped p/ns written to qt_vendor_partnumber_seen
- Quote counts (unique/total) shown on /admin/competitors
- price_method="weighted_median", price_period_days=0 stored explicitly

Fix price_method/price_period_days for warehouse items:
- warehouse: weighted_avg, period=0
- competitor: weighted_median, period=0
- Removes misleading DB defaults (was: median/90)

Update bible: architecture.md, pricelist.md, history.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bible-local/architecture.md

@@ -33,7 +33,7 @@ PriceForge/
 │   ├── config/               # YAML config loading
 │   ├── db/                   # DB connection, connection pool
 │   ├── dbutil/               # DB utilities
-│   ├── handlers/             # HTTP handlers (7 files)
+│   ├── handlers/             # HTTP handlers (12 files)
 │   ├── localdb/              # SQLite for local settings
 │   ├── lotmatch/             # LOT mapping resolver
 │   ├── middleware/           # HTTP middleware
@@ -43,17 +43,22 @@ PriceForge/
 │   │   ├── alerts/           # Alert service
 │   │   ├── pricelist/        # Pricelist service
 │   │   ├── pricing/          # Price calculation
-│   │   ├── sync/             # Sync (diagnostics only)
-│   │   ├── stock_import.go   # Stock file import
+│   │   ├── sync/             # Sync (4 files)
+│   │   ├── stock_import.go   # Stock import: core, Import, replaceStockLogs
+│   │   ├── stock_mappings.go # Stock import: mappings, ignore rules, seen-index
+│   │   ├── stock_parse.go    # Stock import: XLSX/MXL parsing, date detection
+│   │   ├── competitor_import.go # Competitor Excel import, pricelist build
 │   │   ├── vendor_mapping.go # Vendor mapping service
 │   │   └── component.go      # Component service
 │   ├── tasks/                # Background Task Manager
 │   └── warehouse/            # Warehouse price calculation
-├── migrations/               # SQL migrations (25 files)
+├── migrations/               # SQL migrations (39 files)
 ├── scripts/                  # Build and release scripts
 ├── web/
-│   ├── static/               # app.css (Tailwind)
-│   └── templates/            # HTML templates (9 files)
+│   ├── static/
+│   │   ├── app.css           # Tailwind CSS
+│   │   └── js/               # Page JS (6 files, extracted from templates)
+│   └── templates/            # HTML templates (shell only, JS in static/js/)
 ├── CLAUDE.md                 # AI agent instructions
 ├── README.md                 # Quick start
 └── todo.md                   # Operational task list
@@ -89,19 +94,23 @@ HTTP Request
 
 ## Key Modules
 
-### internal/handlers/ (7 files)
+### internal/handlers/ (12 files)
 
 | File | Purpose |
 |------|---------|
-| `web.go` | Page rendering: Index, Lot, AdminPricing, Pricelists, VendorMappings |
+| `web.go` | Page rendering |
 | `component.go` | Component list and detail endpoints |
-| `pricing.go` | Pricing admin: stats, components, recalc, stock, vendor mappings, alerts |
+| `pricing.go` | PricingHandler struct, NewPricingHandler, stats, query helpers |
+| `pricing_components.go` | ListComponents, GetComponentPricing, UpdatePrice, RecalculateAll, PreviewPrice |
+| `pricing_alerts.go` | ListAlerts, AcknowledgeAlert, ResolveAlert, IgnoreAlert |
+| `pricing_stock.go` | ImportStockLog, stock mappings, ignore rules |
+| `pricing_vendor.go` | Vendor mappings CRUD, CSV import/export |
+| `pricing_lots.go` | ListLotsTable, CreateLot, ListLots, GetLotStats, PartnumberBooks |
 | `pricelist.go` | Pricelist CRUD and CSV export |
+| `competitor.go` | Competitor CRUD, import, ParseHeaders |
 | `setup.go` | DB connection setup and test |
 | `sync.go` | Sync diagnostic endpoints |
 
-(6 files; `sync_readiness_test.go` is a test file)
-
 ### internal/services/
 
 | File/dir | Purpose |
@@ -109,7 +118,14 @@ HTTP Request
 | `pricelist/` | Create Estimate, Warehouse, Competitor pricelists |
 | `pricing/` | Price calc: median, weighted_median, coefficients |
 | `alerts/` | Alert generation (price staleness, demand) |
-| `stock_import.go` | Import .mxl/.xlsx, seen-tracking, batch processing |
+| `stock_import.go` | Stock import core: Import, replaceStockLogs, buildWarehousePricelistItems |
+| `stock_mappings.go` | Mappings, ignore rules, seen-index (upsertSeenRows) |
+| `stock_parse.go` | XLSX/MXL parsing, date detection, XLSX helper functions |
+| `competitor_import.go` | Competitor Excel import, p/n→lot resolution, pricelist build |
+| `sync/service.go` | Sync service struct, status, heartbeat |
+| `sync/sync_pricelists.go` | Pricelist sync to local DB |
+| `sync/sync_changes.go` | Push pending changes (configurations, projects) |
+| `sync/sync_import.go` | Import configurations/projects to local DB |
 | `vendor_mapping.go` | Resolve partnumber → LOT, bundles, ignore |
 | `component.go` | Component listing and search |