Remove MCP backend, entrypoint injection, and docs; add migration shim

Completes the removal begun in the previous commit.

Backend: deletes models/mcp_server.rs, storage/mcp_store.rs and
commands/mcp_commands.rs, the McpStore on AppState, the four IPC
handlers, Project::enabled_mcp_servers, build_mcp_servers_json(),
compute_mcp_fingerprint(), the MCP_SERVERS_JSON env injection, the
mcp-fingerprint label, and the whole MCP container lifecycle.
create_container() and container_needs_recreation() lose their
mcp_servers/network_name parameters.

Container: entrypoint.sh no longer merges MCP_SERVERS_JSON into
~/.claude.json. MCP_SERVERS_JSON stays in the reserved env blocklist.

Security: the Docker socket is no longer auto-mounted for stdio+Docker
MCP servers — it now mounts only when allow_docker_access is set.

Migration: old containers were created with
network_mode=triple-c-net-<projectId> and refuse to start once that
network is gone. docker/network.rs becomes docker/legacy_cleanup.rs with
label-driven, best-effort removal of leftover MCP containers and the
per-project network, called on both delete and recreate.
container_needs_recreation() now forces a rebuild for any container
carrying a non-empty triple-c.mcp-fingerprint label or attached to a
triple-c-net-* network, moving it onto the default bridge. Both can be
dropped a release later.

Docs: drops the MCP sections from README/HOW-TO-USE/TECHNICAL and adds a
short note pointing at Claude Code's native `claude mcp` / `/mcp` /
.mcp.json instead.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/src-tauri/src/models/mcp_server.rs

@@ -1,70 +0,0 @@
-use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
-
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
-#[serde(rename_all = "snake_case")]
-pub enum McpTransportType {
-    Stdio,
-    #[serde(alias = "sse")]
-    Http,
-}
-
-impl Default for McpTransportType {
-    fn default() -> Self {
-        Self::Stdio
-    }
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct McpServer {
-    pub id: String,
-    pub name: String,
-    #[serde(default)]
-    pub transport_type: McpTransportType,
-    pub command: Option<String>,
-    #[serde(default)]
-    pub args: Vec<String>,
-    #[serde(default)]
-    pub env: HashMap<String, String>,
-    pub url: Option<String>,
-    #[serde(default)]
-    pub headers: HashMap<String, String>,
-    #[serde(default)]
-    pub docker_image: Option<String>,
-    #[serde(default)]
-    pub container_port: Option<u16>,
-    pub created_at: String,
-    pub updated_at: String,
-}
-
-impl McpServer {
-    pub fn new(name: String) -> Self {
-        let now = chrono::Utc::now().to_rfc3339();
-        Self {
-            id: uuid::Uuid::new_v4().to_string(),
-            name,
-            transport_type: McpTransportType::default(),
-            command: None,
-            args: Vec::new(),
-            env: HashMap::new(),
-            url: None,
-            headers: HashMap::new(),
-            docker_image: None,
-            container_port: None,
-            created_at: now.clone(),
-            updated_at: now,
-        }
-    }
-
-    pub fn is_docker(&self) -> bool {
-        self.docker_image.is_some()
-    }
-
-    pub fn mcp_container_name(&self) -> String {
-        format!("triple-c-mcp-{}", self.id)
-    }
-
-    pub fn effective_container_port(&self) -> u16 {
-        self.container_port.unwrap_or(3000)
-    }
-}

app/src-tauri/src/models/mod.rs

@@ -2,10 +2,8 @@ pub mod project;
 pub mod container_config;
 pub mod app_settings;
 pub mod update_info;
-pub mod mcp_server;
 
 pub use project::*;
 pub use container_config::*;
 pub use app_settings::*;
 pub use update_info::*;
-pub use mcp_server::*;

app/src-tauri/src/models/project.rs

@@ -92,8 +92,6 @@ pub struct Project {
     #[serde(default)]
     pub claude_instructions: Option<String>,
     #[serde(default)]
-    pub enabled_mcp_servers: Vec<String>,
-    #[serde(default)]
     pub claude_code_settings: Option<ClaudeCodeSettings>,
     /// User-defined display names for terminal tabs, keyed by session id.
     #[serde(default)]
@@ -220,7 +218,6 @@ impl Project {
             custom_env_vars: Vec::new(),
             port_mappings: Vec::new(),
             claude_instructions: None,
-            enabled_mcp_servers: Vec::new(),
             claude_code_settings: None,
             renamed_session_names: HashMap::new(),
             created_at: now.clone(),