feat: Add detailed component diagrams and architecture overviews to Building Block View documentation

docs/architecture/05_building_block_view.md

@@ -43,9 +43,56 @@ Refer to the detailed architecture chapters in `docs/architecture/`:
 - **Middleware** (`middleware/validation.py`): applies JSON validation before requests reach routers.
 - **Testing** (`tests/unit/`): pytest suite covering route and service behavior, including UI rendering checks and negative-path router validation tests to ensure consistent HTTP error semantics. Playwright end-to-end coverage is planned for core smoke flows (dashboard load, scenario inputs, reporting) and will attach in CI once scaffolding is completed.
 
-### Component Diagram
+### Level 1 Overview
 
-# System Architecture — Mermaid Diagram
+```mermaid
+graph LR
+  U["User (Browser)"]
+
+  subgraph FE[Frontend]
+    FE_TPL["Templates (Jinja2)"]
+    FE_STATIC["Static Assets (CSS/JS)"]
+    FE_PARTS["Reusable Partials"]
+    FE_SETTINGS["Settings View & JS"]
+  end
+
+  subgraph BE[Backend — FastAPI]
+    BE_APP["FastAPI App (main.py)"]
+    BE_ROUTES["Routers"]
+    BE_SERVICES["Services"]
+    BE_MODELS["Models (SQLAlchemy)"]
+    BE_DB["Database Layer"]
+  end
+
+  subgraph MW[Middleware & Utilities]
+    MW_VAL["JSON Validation Middleware"]
+  end
+
+  subgraph QA[Testing]
+    QA_UNIT["Unit Tests (pytest)"]
+    QA_E2E["E2E (Playwright, planned)"]
+  end
+
+  %% High-level flows
+  U -->|HTTP| BE_APP
+  U --> FE
+  FE --> BE_ROUTES
+  BE_APP --> BE_ROUTES
+  BE_ROUTES --> BE_SERVICES
+  BE_SERVICES --> BE_MODELS
+  BE_MODELS --> BE_DB
+
+  MW_VAL --> BE_APP
+
+  QA_UNIT --> BE_ROUTES
+  QA_UNIT --> BE_SERVICES
+  QA_UNIT --> FE
+  QA_UNIT --> MW_VAL
+  QA_E2E --> U
+  QA_E2E --> BE_APP
+```
+
+### Level 2 Overview
 
 ```mermaid
 graph LR
@@ -57,16 +104,28 @@ graph LR
 
   %% === Frontend ===
   subgraph FE[Frontend]
-    TPL["Jinja2 Templates\n(templates/)\n• base layout + sidebar"]
-    PARTS["Reusable Partials\n(templates/partials/components.html)\n• inputs • empty states • table wrappers"]
-    STATIC["Static Assets\n(static/)\n• CSS: static/css/main.css (palette via CSS vars)\n• JS: static/js/*.js (page modules)"]
-    SETPAGE["Settings View\n(templates/settings.html)"]
-    SETJS["Settings Logic\n(static/js/settings.js)\n• validation • submit • live CSS updates"]
+    TPL["Jinja2 Templates
+(templates/)
+• base layout + sidebar"]
+    PARTS["Reusable Partials
+(templates/partials/components.html)
+• inputs • empty states • table wrappers"]
+    STATIC["Static Assets
+(static/)
+• CSS: static/css/main.css (palette via CSS vars)
+• JS: static/js/*.js (page modules)"]
+    SETPAGE["Settings View
+(templates/settings.html)"]
+    SETJS["Settings Logic
+(static/js/settings.js)
+• validation • submit • live CSS updates"]
   end
 
   %% === Backend ===
-  subgraph BE[Backend FastAPI]
-    MAIN["FastAPI App\n(main.py)\n• routers • middleware • startup/shutdown"]
+  subgraph BE[Backend — FastAPI]
+    MAIN["FastAPI App
+(main.py)
+• routers • middleware • startup/shutdown"]
 
     subgraph ROUTES[Routers]
       R_SCN["scenarios"]
@@ -79,14 +138,22 @@ graph LR
       R_SIM["simulations"]
       R_REP["reporting"]
       R_UI["ui.py (metadata for UI)"]
-      DEP["dependencies.get_db\n(shared SQLAlchemy session)"]
+      DEP["dependencies.get_db
+(shared SQLAlchemy session)"]
     end
 
     subgraph SRV[Services]
-      S_BLL["Business Logic Layer\n• orchestrates models + calc"]
+      S_BLL["Business Logic Layer
+• orchestrates models + calc"]
       S_REP["Reporting Calculations"]
-      S_SIM["Monte Carlo\n(simulation scaffolding)"]
-      S_SET["Settings Manager\n(services/settings.py)\n• defaults via CSS vars\n• persistence in DB\n• env overrides\n• surfaces to API & UI"]
+      S_SIM["Monte Carlo
+(simulation scaffolding)"]
+      S_SET["Settings Manager
+(services/settings.py)
+• defaults via CSS vars
+• persistence in DB
+• env overrides
+• surfaces to API & UI"]
     end
 
     subgraph MOD[Models]
@@ -101,7 +168,8 @@ graph LR
     end
 
     subgraph DB[Database Layer]
-      CFG["config/database.py\n(SQLAlchemy engine & sessions)"]
+      CFG["config/database.py
+(SQLAlchemy engine & sessions)"]
       PG[("PostgreSQL")]
       APPSET["application_setting table"]
     end
@@ -109,12 +177,18 @@ graph LR
 
   %% === Middleware & Utilities ===
   subgraph MW[Middleware & Utilities]
-    VAL["JSON Validation Middleware\n(middleware/validation.py)"]
+    VAL["JSON Validation Middleware
+(middleware/validation.py)"]
   end
 
   subgraph TEST[Testing]
-    UNIT["pytest unit tests\n(tests/unit/)\n• routes • services • UI rendering\n• negative-path validation"]
-    E2E["Playwright E2E (planned)\n• dashboard • scenario inputs • reporting\n• attach in CI"]
+    UNIT["pytest unit tests
+(tests/unit/)
+• routes • services • UI rendering
+• negative-path validation"]
+    E2E["Playwright E2E (planned)
+• dashboard • scenario inputs • reporting
+• attach in CI"]
   end
 
   %% ===================== Edges / Flows =====================
@@ -170,17 +244,6 @@ graph LR
   class PG store;
 ```
 
----
-
-**Notes**
-
-- Arrows represent primary data/command flow. Dashed arrows denote shared dependencies (injected SQLAlchemy session).
-- The settings pipeline shows how environment overrides and DB-backed defaults propagate to both API and UI.
-
-```
-
-```
-
 ## Module Map (code)
 
 - `scenario.py`: central scenario entity with relationships to cost, consumption, production, equipment, maintenance, and simulation results.