Rename app from chat to neoirc, binary to neoircd (closes #46) (#47)

Complete rename of the application from `chat` to `neoirc` with binary name `neoircd`.

closes #46

## Changes

- **Go module path**: `git.eeqj.de/sneak/chat` → `git.eeqj.de/sneak/neoirc`
- **Server binary**: `chatd` → `neoircd`
- **CLI binary**: `chat-cli` → `neoirc-cli`
- **Cmd directories**: `cmd/chatd` → `cmd/neoircd`, `cmd/chat-cli` → `cmd/neoirc-cli`
- **Go package**: `chatapi` → `neoircapi`
- **Makefile**: binary name, build targets, docker image tag, clean target
- **Dockerfile**: binary paths, user/group names (`chat` → `neoirc`), ENTRYPOINT
- **`.gitignore`/`.dockerignore`**: artifact names
- **All Go imports and doc comments**
- **Default server name**: `chat` → `neoirc`
- **Web client**: localStorage keys (`chat_token`/`chat_channels` → `neoirc_token`/`neoirc_channels`), page title, default server display name
- **Schema files**: all `$id` URLs and example hostnames
- **README.md**: project name, all binary references, examples, directory tree
- **AGENTS.md**: build command reference
- **Test fixtures**: app name and channel names

Docker build passes. All tests pass.

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Co-authored-by: clawbot <clawbot@noreply.eeqj.de>
Reviewed-on: #47
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>

cmd/neoircd/main.go

@@ -0,0 +1,41 @@
+// Package main is the entry point for the neoircd server.
+package main
+
+import (
+	"git.eeqj.de/sneak/neoirc/internal/config"
+	"git.eeqj.de/sneak/neoirc/internal/db"
+	"git.eeqj.de/sneak/neoirc/internal/globals"
+	"git.eeqj.de/sneak/neoirc/internal/handlers"
+	"git.eeqj.de/sneak/neoirc/internal/healthcheck"
+	"git.eeqj.de/sneak/neoirc/internal/logger"
+	"git.eeqj.de/sneak/neoirc/internal/middleware"
+	"git.eeqj.de/sneak/neoirc/internal/server"
+	"go.uber.org/fx"
+)
+
+var (
+	// Appname is the application name, set at build time.
+	Appname = "neoirc" //nolint:gochecknoglobals
+
+	// Version is the application version, set at build time.
+	Version string //nolint:gochecknoglobals
+)
+
+func main() {
+	globals.Appname = Appname
+	globals.Version = Version
+
+	fx.New(
+		fx.Provide(
+			config.New,
+			db.New,
+			globals.New,
+			handlers.New,
+			logger.New,
+			server.New,
+			middleware.New,
+			healthcheck.New,
+		),
+		fx.Invoke(func(*server.Server) {}),
+	).Run()
+}