Eliminate Python dependency: embed frontend assets in odoo-go

- Copy all OWL frontend assets (JS/CSS/XML/fonts/images) into frontend/
  directory (2925 files, 43MB) — no more runtime reads from Python Odoo
- Replace OdooAddonsPath config with FrontendDir pointing to local frontend/
- Rewire bundle.go, static.go, templates.go, webclient.go to read from
  frontend/ instead of external Python Odoo addons directory
- Auto-detect frontend/ and build/ dirs relative to binary in main.go
- Delete obsolete Python helper scripts (tools/*.py)

The Go server is now fully self-contained: single binary + frontend/ folder.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/hr/static/src/scss/hr.scss

@@ -0,0 +1,109 @@
+.o_hr_department_kanban .o_kanban_renderer {
+    --KanbanRecord-width: 450px;
+    --KanbanRecord-width-small: 350px;
+}
+
+.o_icon_employee_absent {
+    color: $warning;
+}
+
+.o_hr_employee_form_view .o_form_renderer {
+    .o_form_sheet_bg {
+        max-width: unset;
+    }
+    .o_employee_chat_btn {
+        display: flex;
+        flex-direction: row;
+        align-items: center;
+        margin-bottom: 5px;
+        @include media-breakpoint-down(md) {
+            margin-left: 0!important;
+        }
+    }
+    .o_employee_avatar {
+        position: relative;
+        width: fit-content;
+        display: flex;
+        flex-direction: column;
+        align-items: flex-start;
+        .o_employee_availability {
+            position: absolute;
+            z-index: 1;
+            top: 0px;
+            right: -5px;
+            padding-bottom: 1px;
+            border-radius: 50%;
+            background-color: $o-view-background-color;
+            height: 1rem;
+            width: 1rem;
+            * {
+                margin-bottom: 4px;
+                height: 1rem;
+                width: 1rem;
+            }
+        }
+    }
+    .oe_title {
+        flex: 1;
+    }
+    .o_employee_form_header_info{
+        flex: 5;
+    }
+    .o_presence_status_pill_wrapper{
+        flex: 3;
+    }
+}
+
+.o_hr_employee_kanban .o_kanban_renderer {
+    .o_employee_availability {
+        margin: unset !important;
+    }
+}
+
+.hr_tags {
+    margin-right: 20%;
+}
+
+.o_hr_narrow_field {
+    width: 8rem!important;
+    max-width: 8rem!important;
+    * {
+        max-width: 100%;
+    }
+}
+
+.o_hr_percentage_narrow_field input {
+    max-width: 8rem !important;
+    width: 8rem !important;
+    * {
+        max-width: 100%;
+    }
+}
+
+@for $size from 1 through 15 {
+    .o_hr_narrow_field-#{$size} {
+        width: #{$size}rem!important;
+        max-width: #{$size}rem!important;
+    }
+}
+
+@include media-breakpoint-up(lg) {
+    .o_hr_column {
+        padding: 0 calc(var(--gutter-x) * 1)!important;
+
+        &:first-child {
+            padding-left: calc(var(--gutter-x) * .5)!important;
+        }
+        &:last-child {
+            padding-right: calc(var(--gutter-x) * .5)!important;
+        }
+    }
+}
+
+.o_hr_version_list_view th[data-name="date_version"] {
+    width: 8rem !important;
+}
+
+.button-on {
+    color: $o-success;
+}