Update: 将子项目从 submodule 转为完整内容

- 移除 GovAI, nomifun-tauri, 算力盒子 的 submodule 引用
- 添加所有子项目的完整源代码
- 保留原始 .git 为 .git.bak 备份

nomifun-tauri/test-data/builtin-skills/mermaid/references/syntax.md

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+# Mermaid Syntax Quick Reference
+
+## Flowchart
+
+```mermaid
+graph TD
+    A[Start] --> B{Decision}
+    B -->|Yes| C[Action 1]
+    B -->|No| D[Action 2]
+    C --> E[End]
+    D --> E
+```
+
+Directions: `TD` (top-down), `LR` (left-right), `BT`, `RL`
+
+Node shapes:
+
+- `A[text]` - rectangle
+- `A(text)` - rounded
+- `A{text}` - diamond
+- `A([text])` - stadium
+- `A[[text]]` - subroutine
+- `A[(text)]` - cylinder
+- `A((text))` - circle
+
+## Sequence Diagram
+
+```mermaid
+sequenceDiagram
+    participant A as Alice
+    participant B as Bob
+    A->>B: Hello
+    B-->>A: Hi
+    A->>+B: Request
+    B->>-A: Response
+    Note over A,B: Shared note
+```
+
+Arrows: `->>` solid, `-->>` dashed, `-x` cross, `-)` open
+
+## State Diagram
+
+```mermaid
+stateDiagram-v2
+    [*] --> Idle
+    Idle --> Running: start
+    Running --> Idle: stop
+    Running --> [*]: terminate
+```
+
+## Class Diagram
+
+```mermaid
+classDiagram
+    class Animal {
+        +String name
+        +eat()
+    }
+    class Dog {
+        +bark()
+    }
+    Animal <|-- Dog
+```
+
+Relations: `<|--` inheritance, `*--` composition, `o--` aggregation, `-->` association
+
+## ER Diagram
+
+```mermaid
+erDiagram
+    USER ||--o{ ORDER : places
+    ORDER ||--|{ LINE-ITEM : contains
+    PRODUCT ||--o{ LINE-ITEM : includes
+```
+
+Cardinality: `||` one, `o|` zero or one, `}|` one or more, `}o` zero or more